Mercer County, OH — Planting Guide
Top priorities for Mercer County, Ohio gardeners in June
June is a pivotal month for Mercer County, Ohio gardens. Focus on these tasks first and you'll set up the rest of the season for success.
-
Time to start basil, pole beans, and thai basil inside
Label every cell. You will absolutely forget which is which otherwise.
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Basket week: carrots, green beans, and kale
Don't tug. Use scissors or pruners for clean cuts — torn stems invite disease.
July prep starts now
- Starting indoors: peppers, begonias, and eggplant
- First harvests: basil, carrots, and cucumber
Mercer County is in USDA Zone 6a. The average last spring frost is April 25 and the first fall frost is October 17, giving you a growing season of approximately 175 days.
At an elevation of 874 ft, Mercer County receives approximately 32.7 in of rainfall annually. Summer highs average 84°F with winter lows around 16°F. The predominant soil type is Silt Loam.
Based on 31 years of NOAA climate station data, the last frost date here varies by 25 days year to year — ranging from April 13 in warm years to May 9 in cold years. The growing season is trending shorter by about 1.32 days per decade. Mercer County scores 69/100 (Good) on the Microclimate Index.
🌡️ Zone
6a (-10°F to -5°F min)
❄️ Last Frost
April 25
🍂 First Frost
October 17
📅 Growing Season
175 days
⛰️ Elevation
874 ft
🌧️ Annual Rainfall
32.7 in
Monthly Watering Calendar for Mercer County
When you'll need to water your garden — based on average monthly rainfall vs. the ~1 inch/week most gardens need.
What this means for you: A drip irrigation system pays for itself in 1-2 seasons in any climate. Mercer County's 33" annual rainfall determines whether you'll run it weekly (dry zones) or maybe just during summer dry spells (wet zones).
View detailed monthly data
| Month | Avg Rainfall | Rainy Days | Extra Water Needed | Watering Effort |
|---|---|---|---|---|
| Jan | 1.3 in | 6 days | — | None |
| Feb | 1.5 in | 6 days | — | None |
| Mar | 2.1 in | 8 days | — | None |
| Apr | 3.1 in | 11 days | 1.2 in | Moderate |
| May | 3.8 in | 10 days | 0.5 in | Low |
| Jun | 4.1 in | 9 days | 0.2 in | Low |
| Jul | 3.6 in | 8 days | 0.7 in | Moderate |
| Aug | 3.3 in | 10 days | 1 in | Moderate |
| Sep | 2.9 in | 9 days | 1.4 in | Moderate |
| Oct | 2.6 in | 8 days | 1.7 in | High |
| Nov | 2.5 in | 8 days | — | None |
| Dec | 2 in | 7 days | — | None |
Annual total: 32.8 in. Water needs vary by crop — tomatoes need ~1.2"/week while herbs like rosemary need only 0.3"/week. Check individual plant pages for crop-specific water budgets that factor in your county's rainfall and soil drainage.
Mercer County Soil Profile
Soil Type
Silt Loam
Soil pH
5.9-6.7
Drainage
Well Drained
Frost Risk Probability
Based on 31 years of NOAA weather station data from 3 stations
Beginners: Plant frost-sensitive crops (tomatoes, peppers, squash) after the "Safe" date on the left. Harvest or cover them before the "Protect by" date on the right. Hardy crops (lettuce, peas, kale) can go in the yellow transition zones.
How to read this table: "Conservative" means you're safe from frost 9 out of 10 years — best for beginners and frost-sensitive crops. "Average year" is the typical date. "Aggressive" means only 1 in 10 years is that warm — experienced gardeners with frost protection can try these dates.
| Planting Strategy | Last Spring Frost | First Fall Frost | Frost-Free Days |
|---|---|---|---|
| Conservative (safest) | May 9 | Oct 27 | 171 days |
| Cautious | Apr 29 | Oct 22 | 176 days |
| Average year | Apr 25 | Oct 17 | 175 days |
| Optimistic | Apr 22 | Oct 11 | 172 days |
| Aggressive (risky) | Apr 13 | Oct 3 | 173 days |
Not very — frost dates can vary by ±25 days year-to-year. Use the "Conservative" row in the table below, and keep row covers handy for surprise late frosts.
Yes — growing seasons are getting shorter here (about 1.3 days per decade). Use the "Conservative" dates and choose fast-maturing varieties.
Gardening Difficulty Score
Mercer County offers good growing conditions. A little planning around frost dates goes a long way.
Local Gardening Help in Mercer County
Free expert help is closer than you think. Your county's cooperative extension office connects you with trained gardeners, soil testing labs, and local programs — all specific to Mercer County's climate and soil.
County Extension Office
Mercer County Ohio State University Extension Extension Office
Phone: 614-292-6181
Visit Extension Office Website →
Extension offices are run by land-grant universities and funded by the USDA. Their advice is free, research-based, and tailored to your county's specific conditions.
Master Gardener Program
Free gardening help from trained volunteers
Master Gardeners are community volunteers who complete 40–60 hours of university horticultural training. They answer gardening questions, diagnose plant problems, and offer workshops — all free.
Many extension offices run a Master Gardener hotline where you can call or email with photos of plant problems for free diagnosis.
Soil Testing
Available through your extension office
Before amending your soil, get it tested. Your extension office offers soil testing (typically $10–$25) that tells you exact pH, nutrient levels, and amendment recommendations specific to what you want to grow.
Services Available in Mercer County
Finding local nurseries & garden centers in Mercer County
Why Buy Local
Local nurseries carry plants that are proven to grow in your area. Staff can give you advice specific to Mercer County's soil and climate that big-box stores can't. Plants from local growers are typically hardier because they're already acclimated to your zone.
How to Find Them
Search for "nurseries near Mercer County OH" or "garden center Mercer County" on Google Maps. Also check with your extension office — they often maintain lists of reputable local nurseries and plant sales.
Community gardens & gardening groups
Community gardens are a great way to learn from experienced gardeners in your area, especially if you're limited on space. Search "community garden Mercer County OH" or check your extension office and local parks department. Facebook groups like "Mercer County Gardeners" or "Ohio Gardening" are also excellent for local advice and plant swaps.
What to Plant After Your Harvest
After your first crops finish, use the remaining frost-free days to grow a second round.
Show 6 more succession options
Sunlight & Day Length in Mercer County
Monthly daylight hours and peak sun — critical for onion varieties, photoperiod-sensitive plants, and solar garden planning.
The practical takeaway: A 14-hour day in June produces dramatically more photosynthesis than a 10-hour day in November. Mercer County's seasonal swing determines which crops can pack growth into spring vs. limp through fall.
Longest Day
14.9 hours
Summer solstice daylight
Shortest Day
9.1 hours
Winter solstice daylight
Peak Sun Hours
9.4 hr/day peak (summer)
Peak sun hours (green dashed line below) account for cloud cover — this is the usable direct sunlight your garden actually receives. Most vegetables need 6+ peak sun hours.
Onion tip: Your long summer days (14+ hours) support long-day onion varieties like Walla Walla, Sweet Spanish, and Ailsa Craig.
View detailed monthly data
| Month | Daylight Hours | Peak Sun Hours | Day Length |
|---|---|---|---|
| January | 9.4 hr | 3.7 hr | Short day |
| February | 10.4 hr | 4.4 hr | Short day |
| March | 11.7 hr | 5.7 hr | Short day |
| April | 13.1 hr | 6.7 hr | Neutral |
| May | 14.3 hr | 8.1 hr | Long day |
| June | 14.9 hr | 9.1 hr | Long day |
| July | 14.6 hr | 9.4 hr | Long day |
| August | 13.6 hr | 8.8 hr | Neutral |
| September | 12.3 hr | 7.1 hr | Neutral |
| October | 10.9 hr | 5.6 hr | Short day |
| November | 9.7 hr | 3.9 hr | Short day |
| December | 9.1 hr | 3.4 hr | Short day |
Peak sun hours factor in typical cloud cover — use these for solar panel and shade-planning calculations.
Soil Temperature & Composting in Mercer County
Monthly soil temps tell you when to plant warm-season crops, and when your compost pile is actively working.
Why it matters: Soil temperature predicts plant emergence better than calendar dates. Mercer County's spring soil warm-up curve tells you which weeks are safe for direct-sow beans, cucumbers, squash, and corn.
Plant Warm Crops When
Soil reaches 60°F+
Soil warm enough from Jun through Sep.
Best Month to Compost
Jun
Microbial activity peaks when soil is warm.
Active Composting
6 months
Solid season. Piles go dormant in winter.
View detailed monthly data
| Month | Soil 4" Deep | Soil 8" Deep | Compost Activity | Time to Finish |
|---|---|---|---|---|
| Jan | 22°F | 30°F | ❄️ Dormant | ~36 weeks |
| Feb | 25°F | 30°F | ❄️ Dormant | ~36 weeks |
| Mar | 31°F | 35°F | ❄️ Dormant | ~36 weeks |
| Apr | 45°F | 46°F | 🐢 Slow | ~24 weeks |
| May | 59°F | 55°F | ♻️ Active | ~14 weeks |
| Jun | 70°F | 64°F | 🔥 Peak | ~8 weeks |
| Jul | 77°F | 71°F | 🔥 Peak | ~8 weeks |
| Aug | 78°F | 75°F | 🔥 Peak | ~8 weeks |
| Sep | 71°F | 71°F | 🔥 Peak | ~8 weeks |
| Oct | 58°F | 61°F | ♻️ Active | ~14 weeks |
| Nov | 44°F | 49°F | 🐢 Slow | ~24 weeks |
| Dec | 31°F | 38°F | ❄️ Dormant | ~36 weeks |
Highlighted rows = soil 60°F+ (safe for warm-season transplants). Compost finishes fastest during peak activity months.
Pest & Disease Pressure in Mercer County
Computed from local climate patterns — warmer, humid conditions increase pest generations and fungal disease risk.
Why this matters: In Mercer County's climate, pest pressure shapes which crops are easy and which are heartbreak. Tomatoes are easy in dry mountain air, hard in humid coast — same plant, completely different gardening experience.
Insect Pest Pressure
Moderate — common pests appear but manageable with monitoring.
Disease Risk
Low disease risk — dry conditions reduce fungal problems.
Seasonal Risk
View 6 common pests in your area
| Pest | Risk Level | Peak Months |
|---|---|---|
| Aphids | Moderate | May, Jun, Jul, Aug |
| Japanese beetles | Moderate | Jun, Jul, Aug |
| Squash bugs | Low | Jun, Jul, Aug |
| Tomato hornworms | Low | Jul, Aug |
| Cabbage loopers | Low | May, Jun, Jul, Aug |
| Slugs | Low | Apr, May, Jun |
Organic pest management tips
- Maintain healthy soil with regular compost additions to build natural pest resistance
- Practice crop rotation annually to break pest cycles
- Encourage beneficial insects with flowering herbs like dill, fennel, and yarrow
Cover Crops for Mercer County
Cover crops protect bare soil, fix nitrogen, suppress weeds, and improve soil structure — with planting dates calibrated for your area.
The practical takeaway: The "chop and drop" approach to cover crops: cut them down right before flowering, let them lay on the surface as mulch, plant your vegetables through the mulch. Less work, healthier soil.
Spring Cover Crops (3 options) — Build soil before the main growing season
| Crop | Plant By | Terminate | N-Fixing | Soil Benefit |
|---|---|---|---|---|
| Buckwheat | May 4 | Aug 15 | — | Rapid growth, attracts pollinators, suppresses weeds |
| Sorghum-sudan grass | May 5 | Aug 8 | — | Massive biomass, breaks compaction, suppresses nematodes |
| White clover | Mar 30 | Aug 22 | ✓ Yes | Living mulch, fixes nitrogen, permanent ground cover |
Summer Cover Crops (1 options) — Fill gaps and suppress weeds between plantings
| Crop | Plant By | Terminate | N-Fixing | Soil Benefit |
|---|---|---|---|---|
| Sunflowers | May 12 | Sep 19 | — | Deep roots break compaction, attract pollinators and beneficial insects |
Fall Cover Crops (6 options) — Plant after harvest to protect soil over winter
| Crop | Plant By | Terminate | N-Fixing | Soil Benefit |
|---|---|---|---|---|
| Austrian winter peas | Aug 21 | Apr 4 | ✓ Yes | Fixes nitrogen, good for heavy clay soils |
| Daikon radish | Aug 21 | Apr 4 | — | Deep taproot breaks compaction, excellent for clay soils |
| Hairy vetch | Aug 10 | Apr 4 | ✓ Yes | Excellent nitrogen fixer, good for depleted soils |
| Oats | Sep 19 | Apr 4 | — | Quick biomass, winterkills in cold zones — no spring tillage needed |
| Winter rye | Jul 24 | Apr 11 | — | Suppresses weeds, prevents erosion, breaks up compacted soil |
| Winter wheat | Jul 22 | Apr 4 | — | Erosion control, weed suppression, good biomass |
Wind & Microclimate in Mercer County
The practical takeaway: Wind is the silent water thief. Every breeze pulls moisture from leaves and soil. Mercer County's 8.0 mph average is one piece of the watering math: rainfall + irrigation must exceed evaporation + transpiration, and wind boosts both losses.
Wind dries soil, stresses plants, and affects frost patterns. Understanding your exposure helps with garden placement.
Seasonal Wind Speed
Spring: 12 mph Summer: 8 mph
Fall: 11 mph Winter: 12 mph
Prevailing wind: SW. Moderate wind — consider a temporary windbreak for young seedlings.
Windbreak Benefit
4.7/10
Moderately beneficial — a simple fence or trellis can protect delicate crops from wind stress.
Frost Pocket Risk
Low
Relatively flat terrain (157 ft range). Frost pocket risk is minimal — garden placement is flexible.
Rainwater Harvesting in Mercer County
How much water you can collect, when to collect it, and what size system you need for your garden.
The practical takeaway: Captured rainwater is better for plants than tap water (no chlorine), works during water restrictions, and reduces stormwater runoff. Mercer County's 33" annual rainfall is a meaningful pool — most homes could capture 10,000+ gallons a year with a decent system.
Annual Collection
16,347 gal
Per 1,000 sq ft of roof area (at 80% collection efficiency)
Recommended Setup
6 rain barrels (55 gal each)
For a typical 500 sq ft garden. Serious collectors: consider a 1,750 gal tank.
Legal Status
Unrestricted
Rainwater harvesting is fully legal in your state with no restrictions.
Best Collection Months
May, Jun, Jul, Aug
Highest rainfall months — your barrels will fill up quickly during these months.
Months to Draw From Storage
Jan, Feb, Dec
Dry months when you'll rely on stored water — size your storage for this gap.
Rainwater collection tips for your area
- Your county receives approximately 32.8 inches of rain per year
- A 1,000 sq ft roof can collect roughly 16,347 gallons annually
- Rainwater harvesting is fully legal in your state
- Stock up on stored water before your dry season (Jan, Feb, Dec)
- Use a first-flush diverter to keep roof debris out of your collection
Soil & Growing Conditions in Mercer County
Soil Type
Silt Loam
Soil pH 5.9–6.7 · Well Drained drainage
Native soil is well-suited to most vegetables and herbs with regular compost additions.
Watering Needs
Drought stress: 3.5/10
Low-to-moderate drought stress. Plan to water 1–2 times per week during peak summer. (32.7 in. annual rainfall)
Season Tips
175-day frost-free season
Start warm-season crops indoors and focus on short-season varieties. Cold frames extend your season by 3–4 weeks in fall.
Your Free Printable Garden Planner
Plan every bed, every planting, every harvest — in one place. This 22-page printable includes your zone's planting calendar, a month-by-month task list, a seed inventory tracker, a harvest log, and succession-planting charts. Built to print, write in, and actually use all season.
Recommended for Your Garden
Test your soil pH, nitrogen, phosphorus, and potassium levels before planting.
Get instant, accurate soil pH readings to fine-tune your amendments.
Boost soil fertility and structure with rich, well-aged organic compost.
🥬 Vegetables to Grow in Mercer County
107 vegetables that grow well in Zone 6a with planting dates for Mercer County.
Show all 107 vegetables with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Fall Plant | Harvest | Days to Maturity |
|---|---|---|---|---|---|---|
| Acorn Squash | Mar 21 | May 2 | May 9 | — | Aug 1 – Sep 5 | 80–100 |
| Amaranth | Feb 28 | May 2 | May 9 | — | Aug 8 – Sep 26 | 90–120 |
| Arugula | Mar 21 | Apr 11 | Apr 25 | Aug 8 | May 30 – Aug 1 | 30–50 |
| Asparagus | — | — | May 9 | — | — | 730–1095 |
| Beets | — | Apr 11 | — | Aug 8 | Jun 6 – Jul 4 | 50–70 |
| Belgian Endive | Mar 21 | Apr 11 | Apr 25 | Aug 8 | Aug 15 – Oct 10 | 110–150 |
| Bitter Melon | Feb 28 | May 2 | May 9 | — | Jul 11 – Aug 22 | 60–90 |
| Black Beans | — | May 2 | — | — | Aug 1 – Sep 19 | 90–120 |
| Bok Choy | Mar 21 | Apr 11 | Apr 25 | Aug 8 | Jun 6 – Jul 11 | 40–60 |
| Broccoli | Mar 21 | Apr 11 | Apr 25 | Aug 8 | Jun 27 – Aug 8 | 60–90 |
| Broccoli Rabe | Mar 21 | Apr 11 | Apr 25 | Aug 8 | Jun 6 – Jul 11 | 40–60 |
| Brussels Sprouts | Mar 21 | Apr 11 | Apr 25 | Aug 8 | Jul 25 – Sep 19 | 90–130 |
| Butternut Squash | Mar 21 | May 2 | May 9 | — | Aug 8 – Sep 12 | 85–110 |
| Cabbage | Mar 21 | Apr 11 | Apr 25 | Aug 8 | Jun 27 – Aug 22 | 60–100 |
| Calabash | Feb 28 | May 2 | May 9 | — | Aug 1 – Sep 26 | 80–120 |
| Carrots | — | Apr 11 | — | Aug 8 | Jun 13 – Jul 18 | 60–80 |
| Cauliflower | Mar 21 | Apr 11 | Apr 25 | Aug 8 | Jun 20 – Aug 22 | 55–100 |
| Celeriac | Mar 21 | Apr 11 | Apr 25 | Aug 8 | Aug 8 – Sep 12 | 100–120 |
| Celery | Mar 21 | Apr 11 | Apr 25 | Aug 8 | Jul 18 – Sep 12 | 80–120 |
| Celtuce | Mar 21 | Apr 11 | Apr 25 | Aug 8 | Jun 27 – Aug 8 | 60–90 |
| Chard | Mar 21 | Apr 11 | Apr 25 | Aug 8 | Jun 20 – Aug 8 | 50–60 |
| Chickpeas | Mar 21 | Apr 11 | Apr 25 | Aug 8 | Jul 18 – Aug 29 | 80–110 |
| Chicory | Mar 21 | Apr 11 | Apr 25 | Aug 8 | Jun 27 – Aug 8 | 60–85 |
| Chinese Cabbage | Mar 21 | Apr 11 | Apr 25 | Aug 8 | Jun 20 – Jul 18 | 50–70 |
| Christmas Lima Beans | Feb 28 | May 2 | May 9 | — | Aug 1 – Sep 5 | 80–100 |
| Collard Greens | Mar 21 | Apr 11 | Apr 25 | Aug 8 | Jun 20 – Aug 22 | 55–75 |
| Corn | — | May 2 | — | — | Jul 4 – Aug 29 | 60–100 |
| Cowpeas | — | May 2 | — | — | Jul 4 – Aug 15 | 60–90 |
| Cress | Mar 21 | Apr 11 | Apr 25 | Aug 8 | May 9 – May 30 | 14–21 |
| Crookneck Squash | Mar 21 | May 2 | May 9 | — | Jun 27 – Jul 25 | 45–60 |
| Crosne | — | Apr 11 | — | Aug 8 | Sep 12 – Oct 24 | 150–200 |
| Cucumber | Mar 21 | May 2 | May 9 | — | Jul 4 – Aug 29 | 50–70 |
| Daikon | — | Apr 11 | — | Aug 8 | Jun 6 – Jul 4 | 50–70 |
| Delicata Squash | Mar 21 | May 2 | May 9 | — | Aug 1 – Sep 5 | 80–100 |
| Edamame | — | May 2 | — | — | Jul 18 – Aug 29 | 75–100 |
| Eggplant | Feb 14 | May 2 | May 9 | — | Jul 18 – Sep 19 | 65–85 |
| Endive | Mar 21 | Apr 11 | Apr 25 | Aug 8 | Jun 13 – Jul 18 | 45–65 |
| Escarole | Mar 21 | Apr 11 | Apr 25 | Aug 8 | Jun 20 – Jul 18 | 50–70 |
| Fava Beans | Mar 21 | Apr 11 | Apr 25 | Aug 8 | Jul 11 – Aug 22 | 75–100 |
| Fennel | Feb 28 | May 2 | May 9 | — | Jul 11 – Aug 22 | 60–90 |
| Garlic | — | — | — | Sep 5 | Dec 5 – Mar 20 | 90–240 |
| Green Beans | — | May 2 | — | — | Jun 27 – Aug 22 | 50–65 |
| Horseradish | — | — | May 9 | — | Sep 12 – Nov 21 | 120–180 |
| Hot Peppers | Feb 14 | May 2 | May 9 | — | Jul 18 – Oct 24 | 70–120 |
| Hubbard Squash | Mar 21 | May 2 | May 9 | — | Aug 22 – Sep 26 | 100–120 |
| Kabocha | Mar 21 | May 2 | May 9 | — | Aug 8 – Sep 5 | 85–100 |
| Kai Lan | Mar 21 | Apr 11 | Apr 25 | Aug 8 | Jun 13 – Jul 11 | 45–60 |
| Kale | Mar 21 | Apr 11 | Apr 25 | Aug 8 | Jun 20 – Aug 15 | 50–70 |
| Kidney Beans | — | May 2 | — | — | Aug 1 – Sep 5 | 85–110 |
| Kohlrabi | Mar 21 | Apr 11 | Apr 25 | Aug 8 | Jun 13 – Jul 18 | 45–65 |
| Komatsuna | Mar 21 | Apr 11 | Apr 25 | Aug 8 | May 30 – Jul 4 | 35–50 |
| Leeks | Mar 21 | Apr 11 | Apr 25 | Aug 8 | Jul 25 – Oct 10 | 90–150 |
| Lentils | Mar 21 | Apr 11 | Apr 25 | Aug 8 | Jul 18 – Aug 29 | 80–110 |
| Lettuce | Mar 21 | Apr 11 | Apr 25 | Aug 8 | May 30 – Aug 8 | 30–60 |
| Lima Beans | — | May 2 | — | — | Jul 4 – Aug 15 | 60–90 |
| Loofah | Feb 28 | May 2 | May 9 | — | Aug 22 – Oct 24 | 100–150 |
| Luffa | Feb 28 | May 2 | May 9 | — | Aug 8 – Oct 24 | 90–150 |
| Mache | Mar 21 | Apr 11 | Apr 25 | Aug 8 | Jun 6 – Jul 11 | 40–60 |
| Melon | Mar 21 | May 2 | May 9 | — | Jul 18 – Sep 5 | 70–100 |
| Microgreens | Mar 21 | Apr 11 | Apr 25 | Aug 8 | May 2 – May 30 | 7–21 |
| Mitsuba | Mar 21 | Apr 11 | Apr 18 | Aug 8 | Jun 13 – Aug 8 | 50–70 |
| Mizuna | Mar 21 | Apr 11 | Apr 25 | Aug 8 | May 30 – Jun 27 | 30–45 |
| Mustard Greens | Mar 21 | Apr 11 | Apr 25 | Aug 8 | May 30 – Aug 1 | 30–50 |
| Napa Cabbage | Mar 21 | Apr 11 | Apr 25 | Aug 8 | Jun 20 – Jul 25 | 55–75 |
| New Zealand Spinach | Feb 28 | May 2 | May 9 | — | Jul 4 – Aug 1 | 55–70 |
| Okra | Feb 28 | May 2 | May 9 | — | Jul 4 – Aug 29 | 50–65 |
| Onion | Mar 21 | Apr 11 | Apr 25 | Aug 8 | Jul 25 – Sep 12 | 90–120 |
| Pac Choi | Mar 21 | Apr 11 | Apr 25 | Aug 8 | Jun 6 – Jul 4 | 40–55 |
| Parsnip | — | Apr 11 | — | Aug 8 | Jul 25 – Sep 5 | 100–130 |
| Patty Pan Squash | Mar 21 | May 2 | May 9 | — | Jun 27 – Jul 25 | 45–60 |
| Peas | Mar 21 | Apr 11 | Apr 25 | Aug 8 | Jun 20 – Aug 15 | 55–70 |
| Peppers | Feb 14 | May 2 | May 9 | — | Jul 11 – Sep 19 | 60–90 |
| Pole Beans | Feb 28 | May 2 | May 9 | — | Jul 4 – Aug 29 | 55–70 |
| Potatoes | Feb 28 | May 2 | May 9 | — | Jul 18 – Sep 26 | 70–120 |
| Pumpkin | Mar 21 | May 2 | May 9 | — | Aug 8 – Sep 26 | 85–120 |
| Purslane | Mar 21 | Apr 11 | Apr 25 | Aug 8 | Jun 6 – Jul 11 | 40–60 |
| Radicchio | Mar 21 | Apr 11 | Apr 25 | Aug 8 | Jun 27 – Aug 1 | 60–80 |
| Radish | — | Apr 11 | — | Aug 8 | May 9 – May 30 | 22–35 |
| Rhubarb | — | — | May 16 | — | — | 365–730 |
| Romanesco | Mar 21 | Apr 11 | Apr 25 | Aug 8 | Jul 11 – Aug 22 | 75–100 |
| Rutabaga | — | Apr 11 | — | Aug 8 | Jul 4 – Aug 8 | 80–100 |
| Salsify | — | Apr 11 | — | Aug 8 | Jul 25 – Sep 5 | 100–130 |
| Savoy Cabbage | Mar 21 | Apr 11 | Apr 25 | Aug 8 | Jul 4 – Aug 29 | 70–110 |
| Scallions | Mar 21 | Apr 11 | Apr 25 | Aug 8 | Jun 20 – Jul 18 | 50–70 |
| Scarlet Runner Beans | Feb 28 | May 2 | May 9 | — | Jul 11 – Aug 15 | 60–80 |
| Shallot | Mar 21 | Apr 11 | Apr 25 | Aug 8 | Jul 25 – Sep 12 | 90–120 |
| Shiso | Mar 7 | May 2 | May 9 | — | Jul 4 – Aug 29 | 50–70 |
| Snap Peas | Feb 28 | May 2 | May 9 | — | Jul 4 – Aug 29 | 55–70 |
| Snow Peas | Mar 21 | Apr 11 | Apr 25 | Aug 8 | Jun 20 – Aug 15 | 50–65 |
| Soybeans | — | May 2 | — | — | Jul 25 – Sep 19 | 80–120 |
| Spaghetti Squash | Mar 21 | May 2 | May 9 | — | Aug 8 – Sep 5 | 85–100 |
| Spinach | Mar 21 | Apr 11 | Apr 25 | Aug 8 | May 30 – Aug 1 | 35–50 |
| Squash (Summer) | Mar 21 | May 2 | May 9 | — | Jun 27 – Aug 29 | 45–65 |
| Squash (Winter) | Mar 21 | May 2 | May 9 | — | Aug 1 – Sep 26 | 80–120 |
| Sunchoke | — | — | May 9 | — | Aug 29 – Oct 24 | 110–150 |
| Sweet Corn | — | May 2 | — | — | Jul 4 – Aug 15 | 60–90 |
| Sweet Potatoes | Feb 28 | May 2 | May 9 | — | Aug 8 – Sep 26 | 90–120 |
| Tatsoi | Mar 21 | Apr 11 | Apr 25 | Aug 8 | May 30 – Jul 4 | 35–50 |
| Tomatillo | Feb 28 | May 2 | May 9 | — | Jul 11 – Sep 19 | 60–85 |
| Tomatoes | Feb 28 | May 2 | May 9 | — | Jul 11 – Sep 19 | 60–85 |
| Turnip | — | Apr 11 | — | Aug 8 | May 23 – Jun 27 | 40–60 |
| Watercress | Mar 21 | Apr 11 | Apr 25 | Aug 8 | Jun 6 – Jul 11 | 40–60 |
| Watermelon | Mar 21 | May 2 | May 9 | — | Jul 18 – Sep 5 | 70–100 |
| Wax Beans | — | May 2 | — | — | Jun 27 – Aug 22 | 50–65 |
| Winter Melon | Feb 28 | May 2 | May 9 | — | Aug 8 – Sep 26 | 90–120 |
| Yard Long Beans | Feb 28 | May 2 | May 9 | — | Jul 4 – Aug 15 | 55–80 |
| Zucchini | Mar 21 | May 2 | May 9 | — | Jun 27 – Aug 22 | 45–60 |
🍓 Fruits to Grow in Mercer County
27 fruits that grow well in Zone 6a with planting dates for Mercer County.
Show all 27 fruits with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Fall Plant | Harvest | Days to Maturity |
|---|---|---|---|---|---|---|
| Alpine Strawberries | — | — | May 16 | — | Aug 15 – Nov 28 | 90–180 |
| Aronia | — | — | May 16 | — | — | 730–1095 |
| Blackberries | — | — | May 16 | — | — | 365–730 |
| Blueberries | — | — | May 16 | — | — | 730–1095 |
| Boysenberries | — | — | May 16 | — | — | 365–730 |
| Cantaloupe | — | — | May 16 | — | Jul 25 – Aug 29 | 70–90 |
| Che Fruit | — | — | May 16 | — | — | 1095–1825 |
| Cranberries | — | — | May 16 | — | — | 730–1095 |
| Currants | — | — | May 16 | — | — | 730–1095 |
| Elderberries | — | — | May 16 | — | — | 730–1095 |
| Goji Berries | — | — | May 16 | — | — | 730–1095 |
| Gooseberries | — | — | May 16 | — | — | 730–1095 |
| Grapes | — | — | May 16 | — | — | 730–1095 |
| Ground Cherry | — | — | May 16 | — | Jul 25 – Sep 19 | 65–80 |
| Hardy Kiwi | — | — | May 16 | — | — | 1095–1825 |
| Haskaps | — | — | May 16 | — | — | 730–1095 |
| Honeydew | — | — | May 16 | — | Aug 8 – Sep 19 | 80–110 |
| Jostaberry | — | — | May 16 | — | — | 730–1095 |
| Lingonberries | — | — | May 16 | — | — | 730–1095 |
| Medlar | — | — | May 16 | — | — | 1095–1825 |
| Mulberries | — | — | May 16 | — | — | 730–1825 |
| Pawpaw | — | — | May 16 | — | — | 1095–2555 |
| Persimmon | — | — | May 16 | — | — | 1095–2555 |
| Quince | — | — | May 16 | — | — | 1095–1825 |
| Raspberries | — | — | May 16 | — | — | 365–730 |
| Serviceberries | — | — | May 16 | — | — | 730–1095 |
| Strawberries | — | — | May 16 | — | Aug 15 – Nov 28 | 90–365 |
🌿 Herbs to Grow in Mercer County
35 herbs that grow well in Zone 6a with planting dates for Mercer County.
Show all 35 herbs with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Fall Plant | Harvest | Days to Maturity |
|---|---|---|---|---|---|---|
| Angelica | Mar 21 | Apr 11 | Apr 18 | Aug 8 | — | 365–730 |
| Anise | Mar 21 | Apr 11 | Apr 18 | Aug 8 | Jul 18 – Oct 3 | 90–120 |
| Basil | Mar 7 | May 2 | May 9 | — | Jul 4 – Sep 5 | 50–75 |
| Bee Balm | — | — | May 2 | — | Aug 1 – Oct 17 | 90–120 |
| Borage | Mar 21 | Apr 11 | Apr 18 | Aug 8 | Jun 13 – Aug 1 | 50–60 |
| Caraway | Mar 21 | Apr 11 | Apr 18 | Aug 8 | — | 365–450 |
| Catnip | — | — | May 2 | — | Jul 4 – Sep 5 | 60–80 |
| Chamomile | Mar 21 | Apr 11 | Apr 18 | Aug 8 | Jun 20 – Aug 29 | 60–90 |
| Chervil | Mar 21 | Apr 11 | Apr 18 | Aug 8 | May 30 – Aug 1 | 40–60 |
| Chives | — | — | May 2 | — | Jul 4 – Sep 12 | 60–90 |
| Cilantro | Mar 21 | Apr 11 | Apr 18 | Aug 8 | May 30 – Aug 1 | 40–60 |
| Comfrey | — | — | May 2 | — | Jul 4 – Sep 12 | 60–90 |
| Cumin | Mar 21 | Apr 11 | Apr 18 | Aug 8 | Aug 1 – Oct 3 | 100–120 |
| Dill | Mar 21 | Apr 11 | Apr 18 | Aug 8 | May 30 – Aug 1 | 40–60 |
| Epazote | Mar 7 | May 2 | May 9 | — | Jun 27 – Aug 22 | 45–60 |
| Fennel (herb) | Mar 21 | Apr 11 | Apr 18 | Aug 8 | Jun 20 – Aug 29 | 60–90 |
| Feverfew | — | — | May 2 | — | Aug 1 – Oct 17 | 90–120 |
| Garlic Chives | — | — | May 2 | — | Jul 4 – Sep 12 | 60–90 |
| Horehound | — | — | May 2 | — | Jul 18 – Sep 12 | 75–90 |
| Hyssop | — | — | May 2 | — | Jul 11 – Sep 12 | 70–90 |
| Lemon Balm | — | — | May 2 | — | Jul 4 – Aug 22 | 60–70 |
| Lemon Thyme | — | — | May 2 | — | Jul 11 – Sep 12 | 70–90 |
| Lovage | — | — | May 2 | — | Jul 11 – Sep 12 | 70–90 |
| Marjoram | — | — | May 2 | — | Jul 4 – Sep 12 | 60–90 |
| Mint | — | — | May 2 | — | Jul 4 – Sep 12 | 60–90 |
| Oregano | — | — | May 2 | — | Jul 4 – Sep 12 | 60–90 |
| Parsley | Mar 21 | Apr 11 | Apr 18 | Aug 8 | Jun 20 – Aug 22 | 60–80 |
| Rue | — | — | May 2 | — | Jul 11 – Sep 12 | 70–90 |
| Sage | — | — | May 2 | — | Jul 18 – Sep 12 | 75–90 |
| Savory | — | — | May 2 | — | Jun 27 – Aug 22 | 50–70 |
| Sorrel | Mar 21 | Apr 11 | Apr 18 | Aug 8 | May 30 – Aug 1 | 40–60 |
| Tarragon | — | — | May 2 | — | Jul 4 – Sep 12 | 60–90 |
| Thai Basil | Mar 7 | May 2 | May 9 | — | Jul 4 – Sep 5 | 50–75 |
| Thyme | — | — | May 2 | — | Jul 11 – Sep 12 | 70–90 |
| Valerian | — | — | May 2 | — | Sep 5 – Nov 14 | 120–180 |
🌸 Flowers to Grow in Mercer County
53 flowers that grow well in Zone 6a with planting dates for Mercer County.
Show all 53 flowers with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Fall Plant | Bloom | Days to Maturity |
|---|---|---|---|---|---|---|
| Ageratum | Mar 7 | Apr 25 | Apr 25 | — | Jun 20 – Sep 26 | 60–75 |
| Alliums | — | — | — | Sep 5 | Oct 3 – Oct 31 | 28–42 |
| Anemones | Mar 28 | — | Apr 25 | — | May 30 – Jun 27 | 90–120 |
| Astilbe | Feb 21 | — | May 2 | — | Jul 11 – Sep 19 | 70–100 |
| Bachelor's Button | Mar 14 | Mar 28 | Apr 25 | Sep 5 | Jun 27 – Sep 12 | 60–90 |
| Begonias | Feb 14 | — | May 2 | — | Jul 11 – Oct 10 | 70–90 |
| Black-eyed Susan | Feb 21 | Apr 25 | May 2 | — | Jul 18 – Oct 31 | 60–80 |
| Bleeding Hearts | Feb 21 | — | May 2 | — | Jun 27 – Aug 1 | 60–90 |
| Calendula | Mar 14 | Mar 28 | Apr 25 | — | Jun 13 – Sep 12 | 50–70 |
| California Poppy | — | Mar 28 | — | — | Jun 6 – Jul 18 | 60–90 |
| Celosia | Mar 21 | May 2 | May 2 | — | Jul 4 – Oct 17 | 60–90 |
| Columbine | Feb 21 | May 9 | May 9 | — | Jul 4 – Aug 8 | 70–100 |
| Coreopsis | Feb 21 | May 2 | May 2 | — | Jul 11 – Oct 31 | 60–80 |
| Cosmos | Mar 28 | Apr 25 | Apr 25 | — | Jul 4 – Oct 10 | 60–90 |
| Crocus | — | — | — | Sep 5 | Jul 25 – Aug 15 | 10–20 |
| Daffodils | — | — | — | Sep 5 | Aug 1 – Aug 22 | 20–40 |
| Dahlias | Mar 28 | May 2 | May 2 | — | Jul 18 – Oct 31 | 70–120 |
| Daylily | Feb 21 | — | May 2 | — | Jul 18 – Oct 31 | 60–90 |
| Dianthus | Feb 28 | Mar 28 | Apr 11 | — | May 30 – Aug 29 | 60–80 |
| Echinacea (Purple Coneflower) | Feb 21 | May 9 | May 9 | — | Aug 1 – Nov 7 | 70–90 |
| Foxglove | Feb 21 | May 2 | May 2 | — | Jun 27 – Aug 1 | 80–120 |
| Gaillardia (Blanket Flower) | Mar 7 | May 2 | May 2 | — | Jul 11 – Nov 14 | 70–100 |
| Geraniums | Feb 14 | — | May 2 | — | Jul 11 – Oct 10 | 70–100 |
| Gladiolus | — | Apr 25 | Apr 25 | — | Jul 11 – Oct 24 | 70–100 |
| Hostas | Feb 14 | — | May 2 | — | Jul 18 – Oct 31 | 60–90 |
| Hyacinths | — | — | — | Sep 5 | Aug 22 – Sep 12 | 14–28 |
| Hydrangeas | Feb 14 | — | May 2 | — | Jul 11 – Oct 17 | 90–150 |
| Impatiens | Feb 28 | — | May 2 | — | Jul 11 – Oct 17 | 60–75 |
| Irises | — | Division | May 2 | — | Jun 27 – Jul 25 | 60–100 |
| Larkspur | — | Mar 28 | — | — | Jun 6 – Aug 1 | 60–90 |
| Lavender | Feb 14 | — | May 9 | — | Jul 18 – Sep 12 | 90–120 |
| Lilies | — | Division | May 2 | — | Jul 11 – Oct 17 | 70–120 |
| Lobelia | Feb 21 | — | Apr 11 | — | Jun 6 – Aug 29 | 70–80 |
| Lupine | Feb 21 | May 2 | May 2 | — | Jun 27 – Aug 1 | 75–100 |
| Marigolds | Mar 14 | May 2 | May 2 | — | Jun 27 – Sep 26 | 50–70 |
| Nasturtium | Mar 28 | May 2 | May 2 | — | Jun 27 – Oct 17 | 55–65 |
| Pansy | Feb 14 | — | Apr 25 | Aug 22 | Jun 20 – Aug 22 | 70–90 |
| Peonies | — | Division | May 2 | — | Jul 4 – Aug 8 | 90–120 |
| Petunia | Feb 28 | — | May 2 | — | Jul 11 – Oct 17 | 70–90 |
| Phlox | Feb 21 | May 2 | May 2 | — | Jul 11 – Oct 3 | 80–110 |
| Portulaca | Mar 21 | May 2 | May 2 | — | Jun 20 – Oct 3 | 50–70 |
| Ranunculus | Mar 14 | — | Apr 25 | — | Jun 6 – Jul 4 | 90–120 |
| Roses | Feb 14 | — | May 2 | — | Jul 11 – Oct 31 | 90–180 |
| Salvia | Feb 21 | — | May 2 | — | Jul 11 – Oct 17 | 70–90 |
| Sedum (Stonecrop) | Feb 21 | — | May 2 | — | Aug 22 – Nov 7 | 60–90 |
| Snapdragon | Feb 14 | Apr 4 | Apr 25 | — | Jul 4 – Sep 12 | 70–100 |
| Sunflower | Apr 4 | May 2 | May 2 | — | Jul 25 – Oct 17 | 70–100 |
| Sweet Alyssum | Mar 7 | Apr 4 | Apr 25 | — | Jun 6 – Aug 15 | 45–60 |
| Sweet Pea | Mar 14 | Mar 21 | Apr 25 | — | Jul 11 – Sep 19 | 65–85 |
| Tulips | — | — | — | Sep 5 | Aug 15 – Sep 12 | 15–30 |
| Vinca (Annual) | Feb 14 | — | May 2 | — | Jul 11 – Oct 17 | 70–90 |
| Yarrow | Feb 21 | Apr 25 | May 2 | — | Jul 11 – Oct 31 | 60–90 |
| Zinnia | Mar 28 | May 2 | May 2 | — | Jul 11 – Oct 17 | 60–70 |