When to plant Vinca (Annual) in Jackson County County,
Jackson County County's short 223-day growing season means one Vinca (Annual) planting between March 19 and April 2. No fall crop in Zone 8a.
When to Plant Vinca (Annual) in Jackson County, AR
Your June game plan for Jackson County, Arkansas
Your Jackson County, Arkansas garden is entering a new phase. Here's what's on the schedule for June and why each task matters now.
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Time to start vinca (annual) inside
These need a head start before your last frost (March 26). Sow into cells now so you're ready to transplant in a few weeks.
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It's harvest week for vinca (annual)
Don't tug. Use scissors or pruners for clean cuts — torn stems invite disease.
Looking ahead to July
- 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.
Jackson County, Arkansas is in USDA Zone 8a. The average last spring frost is March 26 and the first fall frost is November 4, giving you a growing season of approximately 223 days.
At an elevation of 1,468 feet, Jackson County receives approximately 47.2 inches of rainfall annually with predominantly silt loam soil. Summer highs average 91°F, providing good warmth for Vinca (Annual) during the growing season.
Jackson County Soil Profile
Soil Type
Silt Loam
Soil pH
5.2-7
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 Jackson County
How your county's soil matches Vinca (Annual)'s growing requirements.
Soil pH
Your soil pH (5.2–7.0) overlaps with Vinca (Annual)'s range (6.0–7.0), though not a perfect match.
Soil Texture
The silt loam soil in Jackson County is excellent for Vinca (Annual) — good drainage, moisture retention, and nutrient holding capacity.
Organic Matter
Organic matter is moderate (2.8%). Annual compost additions will help Vinca (Annual).
How to Plant Vinca (Annual)
Succession Planting Vinca (Annual)
Sow every 8 weeks. Last sowing by Aug 06 to harvest before frost.
Vinca (Annual) Water Budget
Water stress score is 6/10 — consider drought-tolerant varieties and mulching
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 | — | 3.5" | 0" | ❄️ Dormant |
| Feb | — | 3.7" | 0" | ❄️ Dormant |
| Mar | 2.2" | 4.1" | 0" | ✅ Rainfall sufficient |
| Apr | 2.2" | 3.2" | 0" | ✅ Rainfall sufficient |
| May | 2.2" | 4" | 0" | ✅ Rainfall sufficient |
| Jun | 2.2" | 5" | 0" | ✅ Rainfall sufficient |
| Jul | 2.2" | 5.4" | 0" | ✅ Rainfall sufficient |
| Aug | 2.2" | 4.7" | 0" | ✅ Rainfall sufficient |
| Sep | 2.2" | 3.6" | 0" | ✅ Rainfall sufficient |
| Oct | 2.2" | 2.7" | 0" | ✅ Rainfall sufficient |
| Nov | 2.2" | 3.8" | 0" | ✅ Rainfall sufficient |
| Dec | — | 3.3" | 0" | ❄️ Dormant |
Water needs are for active growing months only (Mar–Nov in Jackson 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 — Jackson County, AR
Vinca (Annual) Planting Calendar
| Activity | When | Date Range |
|---|---|---|
| Start Indoors | January 15 | Jan 15 – Jan 29 |
| Transplant Outdoors | March 19 | Mar 19 – Apr 2 |
| Bloom | May 28 | May 28 – Oct 15 |
Plant 0.1" deep · 10" apart · Rows 12" apart
Month-by-Month Timeline
| Month | Activities |
|---|---|
| January | Start Indoors |
| February | — |
| March | Transplant Outdoors |
| April | Transplant Outdoors |
| May | Bloom |
| June | Bloom |
| July | Bloom |
| August | Bloom |
| September | Bloom |
| October | Bloom |
| November | — |
| December | — |
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: acceptable
🗺️ USDA Zone
Zone 8a
📆 Growing Season
223 days in Jackson County
Growing Tips for Vinca (Annual) in Jackson County
Direct sow Vinca (Annual) outdoors after March 26 in Jackson County when soil has warmed and frost danger has passed.
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 Jackson County, AR?
Jackson County is in Zone 8a with an average last frost of March 26. Plan your Vinca (Annual) planting based on this frost date — see the calendar above for exact timing.
What planting zone is Jackson County, AR?
Jackson County, Arkansas is in USDA Hardiness Zone 8a. The average last spring frost is March 26 and first fall frost is November 4.
When should I plant Vinca (Annual) in Jackson County, ?
In Jackson County, , plant Vinca (Annual) after the last frost (around March 26) and before the first frost (around November 4). Best results when soil holds above 50°F.
What growing zone is Jackson County, for Vinca (Annual)?
Jackson County sits in USDA Zone 8a. Vinca (Annual) grows reliably in zones 3a through 11b, so it's a good fit here.
Can Vinca (Annual) grow in Jackson County's climate?
Yes — Vinca (Annual) grows well in Jackson County's temperate climate. Jackson County averages a 223-day frost-free season, with last frost around March 26 and first frost around November 4.
Your Jackson County Garden Planner — Free
A 22-page printable planner built for Jackson County (Zone 8a). Planting dates, a month-by-month schedule, harvest log, seed inventory, and succession charts — all dialed in for your exact growing season.