When to Plant Tarragon in Colleton County, SC
French tarragon is a perennial herb with slender leaves and a distinctive anise-like flavor essential in French cooking. It does not produce viable seed and must be propagated vegetatively.
Colleton County, South Carolina is in USDA Zone 8a. The average last spring frost is March 10 and the first fall frost is November 13, giving you a growing season of approximately 248 days.
At an elevation of 265 feet, Colleton County receives approximately 58.2 inches of rainfall annually with predominantly sandy loam soil. Summer highs average 96°F, so Tarragon may need afternoon shade and extra watering during peak heat. Sandy soil warms quickly in spring — great for early planting — but Tarragon will need more frequent watering and organic matter to retain nutrients. Ample rainfall means less supplemental watering, but ensure good drainage to prevent Tarragon root diseases.
Colleton County Soil Profile
Soil Type
Sandy Loam
Soil pH
4.9-6
Drainage
Well Drained
Plant 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 Colleton County
How your county's soil matches Tarragon's growing requirements.
Soil pH
Your soil pH (4.9–6.0) is more acidic than Tarragon prefers (6.0–7.5). Add garden lime to raise pH.
Soil Texture
Sandy soil in Colleton County warms quickly in spring but drains fast. Tarragon will need more frequent watering and regular compost additions to retain nutrients.
Drainage
Drainage is adequate for Tarragon.
Organic Matter
Organic matter is moderate (2.1%). Annual compost additions will help Tarragon.
How to Plant Tarragon
Succession Planting Tarragon
Sow every 6.9 weeks. Last sowing by Aug 15 to harvest before frost.
Plant Water Budget
Monthly Watering Guide for Tarragon
Tarragon needs approximately 0.4 inches of water per week (1.7" per month). Here's how your county's rainfall compares month by month.
| Month | Tarragon Needs | Rainfall | You Supplement | Action |
|---|---|---|---|---|
| Jan | — | 4.6" | 0" | ❄️ Dormant |
| Feb | — | 5.3" | 0" | ❄️ Dormant |
| Mar | 1.7" | 6.2" | 0" | ✅ Rainfall sufficient |
| Apr | 1.7" | 4.2" | 0" | ✅ Rainfall sufficient |
| May | 1.7" | 4.5" | 0" | ✅ Rainfall sufficient |
| Jun | 1.7" | 5.8" | 0" | ✅ Rainfall sufficient |
| Jul | 1.7" | 5.7" | 0" | ✅ Rainfall sufficient |
| Aug | 1.7" | 5.5" | 0" | ✅ Rainfall sufficient |
| Sep | 1.7" | 4.1" | 0" | ✅ Rainfall sufficient |
| Oct | 1.7" | 3.4" | 0" | ✅ Rainfall sufficient |
| Nov | 1.7" | 4" | 0" | ✅ Rainfall sufficient |
| Dec | — | 4.8" | 0" | ❄️ Dormant |
Water needs are for active growing months only (Mar–Nov in Colleton County). Supplement amounts are based on average rainfall — actual needs vary with temperature, soil, and mulching.
Tarragon 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.
Tarragon Planting Timeline — Colleton County, SC
Tarragon Planting Calendar
| Activity | When | Date Range |
|---|---|---|
| Transplant Outdoors | March 17 | Mar 17 – Mar 31 |
| Harvest | May 19 | May 19 – Jul 28 |
Plant 0.5" deep · 8" apart · Rows 12" apart
Month-by-Month Timeline
| Month | Activities |
|---|---|
| January | — |
| February | — |
| March | Transplant Outdoors |
| April | — |
| May | Harvest |
| June | Harvest |
| July | Harvest |
| August | — |
| September | — |
| October | — |
| November | — |
| December | — |
Growing Conditions
☀️ Sun
Full Sun (6-8+ hours)
💧 Water
0.4"/week · Natural rainfall sufficient
📅 Days to Maturity
60–90 days
🧪 Soil pH
Needs 6–7.5 · Your soil: too_acidic
🗺️ USDA Zone
Zone 8a
📆 Growing Season
248 days in Colleton County
Growing Tips for Tarragon in Colleton County
Direct sow Tarragon outdoors after March 10 in Colleton County when soil has warmed and frost danger has passed.
Sandy soil in Colleton County dries quickly — mulch Tarragon with 2-3 inches of straw and water deeply 2-3 times per week rather than lightly every day.
With summer highs reaching 96°F in Colleton County, provide afternoon shade for Tarragon and water deeply in the morning.
Common pests for Tarragon in this region include aphids and slugs. Use row covers early in the season and inspect plants weekly.
With 58" of annual rainfall in Colleton County, ensure good drainage for Tarragon — excess moisture can promote root rot and fungal diseases.
General growing tips
Purchase plants or divisions as French tarragon does not grow true from seed. Plant in well-drained soil. Divide every 3-4 years to maintain vigor. Harvest tips regularly for best flavor.
Companion Planting
Good Companions
Check more plant combinations with our Companion Planting Checker →
Tarragon in Other Locations
Frequently Asked Questions
When should I plant Tarragon in Colleton County, SC?
Colleton County is in Zone 8a with an average last frost of March 10. Plan your Tarragon planting based on this frost date — see the calendar above for exact timing.
What planting zone is Colleton County, SC?
Colleton County, South Carolina is in USDA Hardiness Zone 8a. The average last spring frost is March 10 and first fall frost is November 13.
Plan Your Garden with Confidence
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