When to Plant Vinca (Annual) in Kenedy County, TX
This month in Kenedy County, Texas
Welcome to June in Zone 9b. These are the moves that will have the biggest impact on your growing season.
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Basket week: vinca (annual)
The more you pick, the more the plant produces. Letting fruit overripen tells the plant it's time to stop.
Before July arrives, get these ready
- First harvests: vinca (annual)
Annual vinca (Catharanthus roseus), also called Madagascar periwinkle, is one of the most heat- and drought-tolerant bedding plants available. Glossy foliage stays attractive all season while cheerful pinwheel blooms continue without deadheading. A top performer in hot, humid Southern summers where impatiens and begonias struggle. Self-cleaning; requires little maintenance once established.
Kenedy County, Texas is in USDA Zone 9b. The average last spring frost is February 13 and the first fall frost is December 13, giving you a growing season of approximately 303 days.
At an elevation of 1,757 feet, Kenedy County receives approximately 58.7 inches of rainfall annually with predominantly loam soil. Summer highs average 101°F, so Vinca (Annual) may need afternoon shade and extra watering during peak heat. Ample rainfall means less supplemental watering, but ensure good drainage to prevent Vinca (Annual) root diseases.
Kenedy County Soil Profile
Soil Type
Loam
Soil pH
6.6-7.5
Drainage
Well Drained
Vinca (Annual) 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 Kenedy County
How your county's soil matches Vinca (Annual)'s growing requirements.
Soil pH
Your soil pH (6.6–7.5) is more alkaline than Vinca (Annual) prefers (6.0–7.0). Add sulfur or peat moss to lower pH.
Soil Texture
The loam soil in Kenedy County is excellent for Vinca (Annual) — good drainage, moisture retention, and nutrient holding capacity.
Organic Matter
Organic matter is moderate (2.2%). Annual compost additions will help Vinca (Annual).
How to Plant Vinca (Annual)
Succession Planting Vinca (Annual)
Sow every 8 weeks. Last sowing by Sep 14 to harvest before frost.
Vinca (Annual) Water Budget
Monthly Watering Guide for Vinca (Annual)
Vinca (Annual) 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 | Vinca (Annual) Needs | Rainfall | You Supplement | Action |
|---|---|---|---|---|
| Jan | — | 1.5" | 0" | ❄️ Dormant |
| Feb | 2.2" | 2" | 0.2" | 💧 Light watering |
| Mar | 2.2" | 3.9" | 0" | ✅ Rainfall sufficient |
| Apr | 2.2" | 6" | 0" | ✅ Rainfall sufficient |
| May | 2.2" | 8.2" | 0" | ✅ Rainfall sufficient |
| Jun | 2.2" | 9.2" | 0" | ✅ Rainfall sufficient |
| Jul | 2.2" | 8" | 0" | ✅ Rainfall sufficient |
| Aug | 2.2" | 7.8" | 0" | ✅ Rainfall sufficient |
| Sep | 2.2" | 5.6" | 0" | ✅ Rainfall sufficient |
| Oct | 2.2" | 3.2" | 0" | ✅ Rainfall sufficient |
| Nov | 2.2" | 1.9" | 0.3" | 💧 Light watering |
| Dec | 2.2" | 1.4" | 0.8" | 💧 Light watering |
Water needs are for active growing months only (Feb–Dec in Kenedy County). Supplement amounts are based on average rainfall — actual needs vary with temperature, soil, and mulching.
Vinca (Annual) 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.
Vinca (Annual) Planting Timeline — Kenedy County, TX
Vinca (Annual) Planting Calendar
| Activity | When | Date Range |
|---|---|---|
| Start Indoors | December 5 | Dec 5 – Dec 19 |
| Transplant Outdoors | January 16 | Jan 16 – Jan 30 |
| Bloom | March 27 | Mar 27 – Oct 9 |
Plant 0.1" deep · 10" apart · Rows 12" apart
Month-by-Month Timeline
| Month | Activities |
|---|---|
| January | Transplant Outdoors |
| February | — |
| March | Bloom |
| April | Bloom |
| May | Bloom |
| June | Bloom |
| July | Bloom |
| August | Bloom |
| September | Bloom |
| October | Bloom |
| November | — |
| December | Start Indoors |
Growing Conditions
☀️ Sun
Full Sun (6-8+ hours)
💧 Water
0.5"/week · Natural rainfall sufficient
📅 Days to Maturity
70–90 days
🧪 Soil pH
Needs 6–7 · Your soil: too_alkaline
🗺️ USDA Zone
Zone 9b
📆 Growing Season
303 days in Kenedy County
Growing Tips for Vinca (Annual) in Kenedy County
Direct sow Vinca (Annual) outdoors after February 13 in Kenedy County when soil has warmed and frost danger has passed.
With summer highs reaching 101°F in Kenedy County, provide afternoon shade for Vinca (Annual) and water deeply in the morning.
General growing tips
Start seeds indoors 10–12 weeks before last frost — germination requires warm soil (75–80°F) and darkness. Do not cover seeds deeply; they need just a light dusting. Direct sowing is rarely practiced due to slow seedling establishment. Transplant after soil warms and frost danger has passed. Excellent drought tolerance once established; avoid overwatering. Performs best in well-drained beds or containers in full sun.
Companion Planting
Good Companions
Check more plant combinations with our Companion Planting Checker →
Vinca (Annual) in Other Locations
Frequently Asked Questions
When should I plant Vinca (Annual) in Kenedy County, TX?
Kenedy County is in Zone 9b with an average last frost of February 13. Plan your Vinca (Annual) planting based on this frost date — see the calendar above for exact timing.
What planting zone is Kenedy County, TX?
Kenedy County, Texas is in USDA Hardiness Zone 9b. The average last spring frost is February 13 and first fall frost is December 13.
Your Kenedy County Garden Planner — Free
A 22-page printable planner built for Kenedy County (Zone 9b). Planting dates, a month-by-month schedule, harvest log, seed inventory, and succession charts — all dialed in for your exact growing season.