When to Plant Parsley in Williamson County, TX
Williamson County, Texas gardeners: here's your May plan
May rewards gardeners who work with the weather, not against it. Here's how to stay in step this month in Williamson County, Texas.
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Basket week: parsley
Morning harvests are best — cooler temperatures mean crisper produce and longer fridge life.
Coming up in June — start thinking about
- First harvests: parsley
Parsley is a biennial herb available in flat-leaf (Italian) and curly varieties. It is a nutritional powerhouse rich in vitamins C and K and adds fresh flavor to countless dishes.
Williamson County, Texas is in USDA Zone 9a. The average last spring frost is March 5 and the first fall frost is November 22, giving you a growing season of approximately 262 days.
At an elevation of 1,023 feet, Williamson County receives approximately 53.3 inches of rainfall annually with predominantly clay soil. Summer highs average 94°F, providing good warmth for Parsley during the growing season. Clay soil retains moisture well for Parsley, but amend with compost to improve drainage and prevent root rot. Ample rainfall means less supplemental watering, but ensure good drainage to prevent Parsley root diseases.
Williamson County Soil Profile
Soil Type
Clay
Soil pH
7.1-7.8
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 Williamson County
How your county's soil matches Parsley's growing requirements.
Soil pH
Your soil pH (7.1–7.8) is more alkaline than Parsley prefers (6.0–7.0). Add sulfur or peat moss to lower pH.
Soil Texture
Heavy clay soil (46% clay) in Williamson County compacts easily and drains slowly. Amend with compost and avoid working soil when wet.
Drainage
Drainage is adequate for Parsley.
Organic Matter
Organic matter is moderate (2.6%). Annual compost additions will help Parsley.
How to Plant Parsley
Fall planting: Sow 8 weeks before your first frost date for a fall harvest.
Succession Planting Parsley
Sow every 6.9 weeks. Last sowing by Sep 03 to harvest before frost.
For a dedicated fall crop, sow by Sep 27.
Plant Water Budget
Monthly Watering Guide for Parsley
Parsley needs approximately 0.6 inches of water per week (2.6" per month). Here's how your county's rainfall compares month by month.
| Month | Parsley Needs | Rainfall | You Supplement | Action |
|---|---|---|---|---|
| Jan | — | 1.4" | 0" | ❄️ Dormant |
| Feb | — | 2" | 0" | ❄️ Dormant |
| Mar | 2.6" | 3.4" | 0" | ✅ Rainfall sufficient |
| Apr | 2.6" | 6.5" | 0" | ✅ Rainfall sufficient |
| May | 2.6" | 7.7" | 0" | ✅ Rainfall sufficient |
| Jun | 2.6" | 7.6" | 0" | ✅ Rainfall sufficient |
| Jul | 2.6" | 6.6" | 0" | ✅ Rainfall sufficient |
| Aug | 2.6" | 6.1" | 0" | ✅ Rainfall sufficient |
| Sep | 2.6" | 5.4" | 0" | ✅ Rainfall sufficient |
| Oct | 2.6" | 3.7" | 0" | ✅ Rainfall sufficient |
| Nov | 2.6" | 1.7" | 0.9" | 💧 Light watering |
| Dec | — | 1.3" | 0" | ❄️ Dormant |
Water needs are for active growing months only (Mar–Nov in Williamson County). Supplement amounts are based on average rainfall — actual needs vary with temperature, soil, and mulching.
Parsley 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.
Parsley Planting Timeline — Williamson County, TX
Parsley Planting Calendar
| Activity | When | Date Range |
|---|---|---|
| Start Indoors | February 5 | Feb 5 – Feb 19 |
| Transplant Outdoors | February 26 | Feb 26 – Mar 12 |
| Direct Sow | February 12 | Feb 12 – Mar 5 |
| Harvest | April 30 | Apr 30 – Jul 2 |
| Fall Sowing | September 27 | Sep 27 – Oct 11 |
Plant 0.5" deep · 8" apart · Rows 12" apart
Month-by-Month Timeline
| Month | Activities |
|---|---|
| January | — |
| February | Start Indoors Transplant Outdoors Direct Sow |
| March | Transplant Outdoors Direct Sow |
| April | Harvest |
| May | Harvest |
| June | Harvest |
| July | Harvest |
| August | — |
| September | Fall Sowing |
| October | Fall Sowing |
| November | — |
| December | — |
Growing Conditions
☀️ Sun
Partial Shade (3-6 hours)
💧 Water
0.6"/week · Natural rainfall sufficient
📅 Days to Maturity
60–80 days
🧪 Soil pH
Needs 6–7 · Your soil: too_alkaline
🗺️ USDA Zone
Zone 9a
📆 Growing Season
262 days in Williamson County
Growing Tips for Parsley in Williamson County
Direct sow Parsley outdoors after March 05 in Williamson County when soil has warmed and frost danger has passed.
With Williamson County's clay soil (46% clay), work in 3-4 inches of compost before planting Parsley. Avoid tilling when soil is wet to prevent compaction.
Common pests for Parsley in this region include carrot rust fly and parsleyworm. Use row covers early in the season and inspect plants weekly.
General growing tips
Start seeds indoors 6-8 weeks before last frost. Soak seeds overnight as germination is slow. Harvest outer stems first to keep plants productive. Parsley attracts swallowtail butterflies.
Companion Planting
Good Companions
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Check more plant combinations with our Companion Planting Checker →
Parsley in Other Locations
Frequently Asked Questions
When should I plant Parsley in Williamson County, TX?
Williamson County is in Zone 9a with an average last frost of March 5. Plan your Parsley planting based on this frost date — see the calendar above for exact timing.
What planting zone is Williamson County, TX?
Williamson County, Texas is in USDA Hardiness Zone 9a. The average last spring frost is March 5 and first fall frost is November 22.
Your Williamson County Garden Planner — Free
A 24-page printable planner built for Williamson 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.