When to plant Vinca (Annual) in Hernando County, FL
Hernando County's short 326-day growing season means one Vinca (Annual) planting between December 28 and January 11. No fall crop in Zone 9b.
When to Plant Vinca (Annual) in Hernando County, FL
This month in Hernando County, Florida
Each item below is timed to Hernando County, Florida's frost dates and soil temperatures. Skip nothing, stress about nothing.
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It's harvest week for vinca (annual)
Morning harvests are best — cooler temperatures mean crisper produce and longer fridge life.
August prep starts now
- 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.
Hernando County, Florida is in USDA Zone 9b. The average last spring frost is January 25 and the first fall frost is December 16, giving you a growing season of approximately 325 days.
At an elevation of 245 feet, Hernando County receives approximately 51.5 inches of rainfall annually with predominantly sand soil. Summer highs average 99°F, so Vinca (Annual) may need afternoon shade and extra watering during peak heat. Sandy soil warms quickly in spring — great for early planting — but Vinca (Annual) will need more frequent watering and organic matter to retain nutrients. Ample rainfall means less supplemental watering, but ensure good drainage to prevent Vinca (Annual) root diseases.
Hernando County Soil Profile
Soil Type
Sand
Soil pH
5.1-5.9
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 Hernando County
How your county's soil matches Vinca (Annual)'s growing requirements.
Soil pH
Your soil pH (5.1–5.9) is more acidic than Vinca (Annual) prefers (6.0–7.0). Add garden lime to raise pH.
Soil Texture
Sandy soil in Hernando County warms quickly in spring but drains fast. Vinca (Annual) will need more frequent watering and regular compost additions to retain nutrients.
Drainage
Drainage is adequate for Vinca (Annual).
Organic Matter
Organic matter is low (1.4%). Add 2-3 inches of compost before planting Vinca (Annual).
How to Plant Vinca (Annual)
Succession Planting Vinca (Annual)
Sow every 8 weeks. Last sowing by Sep 17 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 | 2.2" | 2.6" | 0" | ✅ Rainfall sufficient |
| Feb | 2.2" | 2.5" | 0" | ✅ Rainfall sufficient |
| Mar | 2.2" | 3" | 0" | ✅ Rainfall sufficient |
| Apr | 2.2" | 2.2" | 0" | ✅ Rainfall sufficient |
| May | 2.2" | 3.3" | 0" | ✅ Rainfall sufficient |
| Jun | 2.2" | 7.1" | 0" | ✅ Rainfall sufficient |
| Jul | 2.2" | 7.5" | 0" | ✅ Rainfall sufficient |
| Aug | 2.2" | 6.7" | 0" | ✅ Rainfall sufficient |
| Sep | 2.2" | 6.8" | 0" | ✅ Rainfall sufficient |
| Oct | 2.2" | 5.1" | 0" | ✅ Rainfall sufficient |
| Nov | 2.2" | 2.4" | 0" | ✅ Rainfall sufficient |
| Dec | 2.2" | 2.2" | 0" | ✅ Rainfall sufficient |
Water needs are for active growing months only (Jan–Dec in Hernando 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 — Hernando County, FL
Vinca (Annual) Planting Calendar
| Activity | When | Date Range |
|---|---|---|
| Start Indoors | November 16 | Nov 16 – Nov 30 |
| Transplant Outdoors | December 28 | Dec 28 – Jan 11 |
| Bloom | March 8 | Mar 8 – Sep 20 |
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 | — |
| November | Start Indoors |
| December | Transplant Outdoors |
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_acidic
🗺️ USDA Zone
Zone 9b
📆 Growing Season
325 days in Hernando County
Growing Tips for Vinca (Annual) in Hernando County
Direct sow Vinca (Annual) outdoors after January 25 in Hernando County when soil has warmed and frost danger has passed.
Sandy soil in Hernando County dries quickly — mulch Vinca (Annual) with 2-3 inches of straw and water deeply 2-3 times per week rather than lightly every day.
With summer highs reaching 99°F in Hernando 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 Hernando County, FL?
Hernando County is in Zone 9b with an average last frost of January 25. Plan your Vinca (Annual) planting based on this frost date — see the calendar above for exact timing.
What planting zone is Hernando County, FL?
Hernando County, Florida is in USDA Hardiness Zone 9b. The average last spring frost is January 25 and first fall frost is December 16.
When should I plant Vinca (Annual) in Hernando County, FL?
In Hernando County, FL, plant Vinca (Annual) after the last frost (around January 25) and before the first frost (around December 16). Best results when soil holds above 50°F.
What growing zone is Hernando County, FL for Vinca (Annual)?
Hernando County sits in USDA Zone 9b. Vinca (Annual) grows reliably in zones 3a through 11b, so it's a good fit here.
Can Vinca (Annual) grow in Hernando County's climate?
Yes — Vinca (Annual) grows well in Hernando County's temperate climate. Hernando County averages a 326-day frost-free season, with last frost around January 25 and first frost around December 16.
Your Hernando County Garden Planner — Free
A 22-page printable planner built for Hernando 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.