When to plant Salvia in Monroe County, MO
Monroe County sits in cold Zone 6a. Plant Salvia April 21–May 5 for the single annual harvest; the October 21 first frost closes the window.
When to Plant Salvia in Monroe County, MO
Your June gardening checklist
Welcome to June in Zone 6a. These are the moves that will have the biggest impact on your growing season.
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Start salvia under lights
You're about 16 weeks out from your last frost — the perfect window to get these germinating indoors.
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Bring in the salvia
Morning harvests are best — cooler temperatures mean crisper produce and longer fridge life.
Looking ahead to July
- First harvests: salvia
Salvia splendens is a tender perennial from Brazil grown as a warm-season annual throughout the US. Its vivid, upright flower spikes in brilliant red, purple, and coral are irresistible to hummingbirds, bees, and butterflies. One of the longest-blooming annuals in the landscape — plants bloom from early summer until hard frost with minimal deadheading required.
Monroe County, Missouri is in USDA Zone 6a. The average last spring frost is April 14 and the first fall frost is October 21, giving you a growing season of approximately 190 days.
At an elevation of 1,128 feet, Monroe County receives approximately 35.1 inches of rainfall annually with predominantly silt loam soil. Summer highs average 83°F, so choose short-season varieties of Salvia to ensure they mature before fall.
Monroe County Soil Profile
Soil Type
Silt Loam
Soil pH
5.7-6.6
Drainage
Well Drained
Salvia Planting Risk Windows
Percentages indicate frost risk at transplant. The 70% safe window means there is a 30% chance of frost after transplant — suitable for cold-hardy crops or gardeners with frost protection. The 90% safe window is best for tender plants.
Soil Compatibility in Monroe County
How your county's soil matches Salvia's growing requirements.
Soil pH
Your soil pH (5.7–6.6) is within Salvia's preferred range (5.5–7.0).
Soil Texture
The silt loam soil in Monroe County is excellent for Salvia — good drainage, moisture retention, and nutrient holding capacity.
Drainage
Drainage is adequate for Salvia.
Organic Matter
Organic matter is moderate (2.8%). Annual compost additions will help Salvia.
How to Plant Salvia
Succession Planting Salvia
Sow every 8 weeks. Last sowing by Jul 23 to harvest before frost.
Salvia Water Budget
Water stress score is 6/10 — consider drought-tolerant varieties and mulching
Monthly Watering Guide for Salvia
Salvia needs approximately 1 inches of water per week (4.3" per month). Here's how your county's rainfall compares month by month.
| Month | Salvia Needs | Rainfall | You Supplement | Action |
|---|---|---|---|---|
| Jan | — | 1.6" | 0" | ❄️ Dormant |
| Feb | — | 1.7" | 0" | ❄️ Dormant |
| Mar | — | 2.2" | 0" | ❄️ Dormant |
| Apr | 4.3" | 3.7" | 0.6" | 💧 Light watering |
| May | 4.3" | 3.6" | 0.7" | 💧 Light watering |
| Jun | 4.3" | 4.9" | 0" | ✅ Rainfall sufficient |
| Jul | 4.3" | 3.9" | 0.4" | 💧 Light watering |
| Aug | 4.3" | 3.7" | 0.6" | 💧 Light watering |
| Sep | 4.3" | 3.3" | 1" | 💧 Light watering |
| Oct | 4.3" | 2.6" | 1.7" | 💧 Light watering |
| Nov | — | 2.4" | 0" | ❄️ Dormant |
| Dec | — | 1.7" | 0" | ❄️ Dormant |
Water needs are for active growing months only (Apr–Oct in Monroe County). Supplement amounts are based on average rainfall — actual needs vary with temperature, soil, and mulching.
Salvia Heat Requirements (GDD)
What are Growing Degree Days (GDD)?
Growing Degree Days measure the total warmth your plants receive during the growing season. Think of it as a "heat bank" — every day above 50°F deposits warmth that helps your plants grow.
Each plant needs a certain amount of accumulated heat to mature. If your county provides more GDD than the plant needs, it's a great fit. If it's close, you may want to choose faster-maturing varieties or start seeds indoors to get a head start.
Salvia Planting Timeline — Monroe County, MO
Salvia Planting Calendar
| Activity | When | Date Range |
|---|---|---|
| Start Indoors | February 10 | Feb 10 – Feb 24 |
| Transplant Outdoors | April 21 | Apr 21 – May 5 |
| Bloom | June 30 | Jun 30 – Oct 6 |
· 12" apart · Rows 18" apart
Month-by-Month Timeline
| Month | Activities |
|---|---|
| January | — |
| February | Start Indoors |
| March | — |
| April | Transplant Outdoors |
| May | Transplant Outdoors |
| June | Bloom |
| July | Bloom |
| August | Bloom |
| September | Bloom |
| October | Bloom |
| November | — |
| December | — |
Growing Conditions
☀️ Sun
Full Sun (6-8+ hours)
💧 Water
1"/week · Natural rainfall sufficient
📅 Days to Maturity
70–90 days
🧪 Soil pH
Needs 5.5–7 · Your soil: ideal
🗺️ USDA Zone
Zone 6a
📆 Growing Season
190 days in Monroe County
Growing Tips for Salvia in Monroe County
Direct sow Salvia outdoors after April 14 in Monroe County when soil has warmed and frost danger has passed.
General growing tips
Start indoors 8-10 weeks before last frost; seeds need 65-70°F soil and light to germinate (surface-sow, do not cover). Transplant after last frost when soil has warmed. Salvia is frost-sensitive — even a light frost kills plants. Pinch spent spikes to encourage continued bloom. Tolerates heat and humidity well once established. In zones 9b-11b can be grown as a short-lived perennial.
Companion Planting
Good Companions
Check more plant combinations with our Companion Planting Checker →
Salvia in Other Locations
Frequently Asked Questions
When should I plant Salvia in Monroe County, MO?
Monroe County is in Zone 6a with an average last frost of April 14. Plan your Salvia planting based on this frost date — see the calendar above for exact timing.
What planting zone is Monroe County, MO?
Monroe County, Missouri is in USDA Hardiness Zone 6a. The average last spring frost is April 14 and first fall frost is October 21.
When should I plant Salvia in Monroe County, MO?
In Monroe County, MO, plant Salvia after the last frost (around April 14) and before the first frost (around October 21). Best results when soil holds above 50°F.
What growing zone is Monroe County, MO for Salvia?
Monroe County sits in USDA Zone 6a. Salvia grows reliably in zones 2a through 11b, so it's a good fit here.
Can Salvia grow in Monroe County's climate?
Yes — Salvia grows well in Monroe County's temperate climate. Monroe County averages a 190-day frost-free season, with last frost around April 14 and first frost around October 21.
Your Monroe County Garden Planner — Free
A 22-page printable planner built for Monroe County (Zone 6a). Planting dates, a month-by-month schedule, harvest log, seed inventory, and succession charts — all dialed in for your exact growing season.