When to plant Coreopsis in Saint Marks, FL
For Coreopsis in Saint Marks, the safe spring window opens around February 27 and closes around March 20. Last expected frost is March 13, first fall frost November 22, giving a 254-day growing season.
When to Plant Coreopsis in Saint Marks, FL
This month in Wakulla County, Florida
We've pulled the most time-sensitive tasks for Wakulla County, Florida this August and put them front and centre. Tackle them in order.
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It's harvest week for coreopsis
Check every 1–2 days. Many of these get tough or go to seed if you wait too long.
To set up a strong September, finish these tasks
- First harvests: coreopsis
Coreopsis (Tickseed) is a cheerful, long-blooming native perennial that produces a continuous flush of bright yellow, gold, or bi-colored daisy-like flowers from early summer well into fall. One of the most reliable cut-and-come-again bloomers in the perennial garden, it thrives in hot, dry, sunny conditions and poor soil where many competitors struggle. An invaluable nectar source for native bees and butterflies, and a butterfly host plant for several species.
Saint Marks, Florida is in USDA Zone 9a. The average last spring frost is March 13 and the first fall frost is November 22, giving you a growing season of approximately 254 days.
At an elevation of 375 feet, Wakulla County receives approximately 48.4 inches of rainfall annually with predominantly sand soil. Summer highs average 95°F, so Coreopsis may need afternoon shade and extra watering during peak heat. Sandy soil warms quickly in spring — great for early planting — but Coreopsis will need more frequent watering and organic matter to retain nutrients.
Saint Marks Soil Profile
Soil Type
Sand
Soil pH
4.9-5.9
Drainage
Well Drained
Coreopsis 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 Saint Marks
How your county's soil matches Coreopsis's growing requirements.
Soil pH
Your soil pH (4.9–5.9) is more acidic than Coreopsis prefers (5.5–7.5). Add garden lime to raise pH.
Soil Texture
Sandy soil in Wakulla County warms quickly in spring but drains fast. Coreopsis will need more frequent watering and regular compost additions to retain nutrients.
Drainage
Drainage is adequate for Coreopsis.
Organic Matter
Organic matter is low (1.3%). Add 2-3 inches of compost before planting Coreopsis.
How to Plant Coreopsis
Succession Planting Coreopsis
Sow every 6.9 weeks. Last sowing by Sep 03 to harvest before frost.
Coreopsis Water Budget
Monthly Watering Guide for Coreopsis
Coreopsis needs approximately 0.5 inches of water per week (2.2" per month). Here's how your county's rainfall compares month by month.
| Month | Coreopsis Needs | Rainfall | You Supplement | Action |
|---|---|---|---|---|
| Jan | — | 2.1" | 0" | ❄️ Dormant |
| Feb | — | 2.5" | 0" | ❄️ Dormant |
| Mar | 2.2" | 2.6" | 0" | ✅ Rainfall sufficient |
| Apr | 2.2" | 2.3" | 0" | ✅ Rainfall sufficient |
| May | 2.2" | 3" | 0" | ✅ Rainfall sufficient |
| Jun | 2.2" | 7.1" | 0" | ✅ Rainfall sufficient |
| Jul | 2.2" | 6.9" | 0" | ✅ Rainfall sufficient |
| Aug | 2.2" | 7.2" | 0" | ✅ Rainfall sufficient |
| Sep | 2.2" | 6.8" | 0" | ✅ Rainfall sufficient |
| Oct | 2.2" | 4" | 0" | ✅ Rainfall sufficient |
| Nov | 2.2" | 1.8" | 0.4" | 💧 Light watering |
| Dec | — | 2.1" | 0" | ❄️ Dormant |
Water needs are for active growing months only (Mar–Nov in Wakulla County). Supplement amounts are based on average rainfall — actual needs vary with temperature, soil, and mulching.
Coreopsis 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.
Coreopsis Planting Timeline — Saint Marks, FL
Coreopsis Planting Calendar
| Activity | When | Date Range |
|---|---|---|
| Start Indoors | January 16 | Jan 16 – Jan 30 |
| Transplant Outdoors | February 27 | Feb 27 – Mar 13 |
| Direct Sow | February 27 | Feb 27 – Mar 20 |
| Bloom | April 24 | Apr 24 – Sep 25 |
Plant 0.1" deep · 18" apart · Rows 24" apart
Month-by-Month Timeline
| Month | Activities |
|---|---|
| January | Start Indoors |
| February | Transplant Outdoors Direct Sow |
| March | Transplant Outdoors Direct Sow |
| April | Bloom |
| May | Bloom |
| June | Bloom |
| July | Bloom |
| August | Bloom |
| September | Bloom |
| October | — |
| November | — |
| December | — |
Growing Conditions
☀️ Sun
Full Sun (6-8+ hours)
💧 Water
0.5"/week · Natural rainfall sufficient
📅 Days to Maturity
60–80 days
🧪 Soil pH
Needs 5.5–7.5 · Your soil: too_acidic
🗺️ USDA Zone
Zone 9a
📆 Growing Season
254 days in Wakulla County
Growing Tips for Coreopsis in Saint Marks
Direct sow Coreopsis outdoors after March 13 in Wakulla County when soil has warmed and frost danger has passed.
Sandy soil in Wakulla County dries quickly — mulch Coreopsis with 2-3 inches of straw and water deeply 2-3 times per week rather than lightly every day.
Common pests for Coreopsis in this region include aphids and slugs. Use row covers early in the season and inspect plants weekly.
General growing tips
Start seeds indoors 8–10 weeks before last frost or direct sow after last frost. Seeds germinate easily without stratification. Thrives in poor to average, well-drained soil — rich soil promotes foliage over flowers. Drought tolerant once established; overwatering is the most common mistake. Deadhead spent blooms to maintain continuous flowering through the season. Shear plants by one-third in midsummer for a fresh flush of late-season blooms. Year 2+ plants bloom most heavily. Divide every 2–3 years in early spring to rejuvenate crowded clumps.
Companion Planting
Good Companions
Check more plant combinations with our Companion Planting Checker →
Coreopsis in Other Locations
When should I plant Coreopsis in Saint Marks, FL?
In Saint Marks, FL, plant Coreopsis after the last frost (around March 13) and before the first frost (around November 22). Best results when soil holds above 50°F.
What growing zone is Saint Marks, FL for Coreopsis?
Saint Marks sits in USDA Zone 9a. Coreopsis grows reliably in zones 3a through 9b, so it's a good fit here.
Can Coreopsis grow in Saint Marks's climate?
Yes — Coreopsis grows well in Saint Marks's temperate climate. Saint Marks averages a 254-day frost-free season, with last frost around March 13 and first frost around November 22.
Your Wakulla County Garden Planner — Free
A 22-page printable planner built for Wakulla County (Zone 9a). Planting dates, a month-by-month schedule, harvest log, seed inventory, and succession charts — all dialed in for your exact growing season.