When to plant Sweet Alyssum in Hernando County, FL
For Sweet Alyssum in Hernando County, the safe spring window opens around November 23 and closes around December 14. Last expected frost is January 25, first fall frost December 16, giving a 326-day growing season. A second sowing from October 7 to October 21 extends the harvest into fall.
When to Plant Sweet Alyssum in Hernando County, FL
Hernando County, Florida gardeners: here's your June plan
Welcome to June in Zone 9b. These are the moves that will have the biggest impact on your growing season.
Sweet Alyssum (Lobularia maritima) is a low-growing cool-season annual prized for its honey-scented clusters of tiny white, pink, or purple flowers. A workhorse border plant, it tolerates light frost, self-seeds readily, and attracts beneficial insects throughout its bloom season. In warm climates it often re-blooms in fall after summer heat fades.
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 Sweet Alyssum may need afternoon shade and extra watering during peak heat. Sandy soil warms quickly in spring — great for early planting — but Sweet Alyssum will need more frequent watering and organic matter to retain nutrients. Ample rainfall means less supplemental watering, but ensure good drainage to prevent Sweet Alyssum root diseases.
Hernando County Soil Profile
Soil Type
Sand
Soil pH
5.1-5.9
Drainage
Well Drained
Sweet Alyssum 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 Sweet Alyssum's growing requirements.
Soil pH
Your soil pH (5.1–5.9) is more acidic than Sweet Alyssum prefers (6.0–7.5). Add garden lime to raise pH.
Soil Texture
Sandy soil in Hernando County warms quickly in spring but drains fast. Sweet Alyssum will need more frequent watering and regular compost additions to retain nutrients.
Drainage
Drainage is adequate for Sweet Alyssum.
Organic Matter
Organic matter is low (1.4%). Add 2-3 inches of compost before planting Sweet Alyssum.
How to Plant Sweet Alyssum
Fall planting: Sow 10 weeks before your first frost date for a fall harvest.
Succession Planting Sweet Alyssum
Sow every 5.1 weeks. Last sowing by Oct 17 to harvest before frost.
For a dedicated fall crop, sow by Oct 07.
Sweet Alyssum Water Budget
Monthly Watering Guide for Sweet Alyssum
Sweet Alyssum 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 | Sweet Alyssum 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.
Sweet Alyssum 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.
Sweet Alyssum Planting Timeline — Hernando County, FL
Sweet Alyssum Planting Calendar
| Activity | When | Date Range |
|---|---|---|
| Transplant Outdoors | December 21 | Dec 21 – Jan 4 |
| Direct Sow | November 23 | Nov 23 – Dec 14 |
| Bloom | January 25 | Jan 25 – Apr 26 |
| Fall Sowing | October 7 | Oct 7 – Oct 21 |
· 6" apart · Rows 8" apart
Month-by-Month Timeline
| Month | Activities |
|---|---|
| January | Transplant Outdoors Bloom |
| February | Bloom |
| March | Bloom |
| April | Bloom |
| May | — |
| June | — |
| July | — |
| August | — |
| September | — |
| October | Fall Sowing |
| November | Direct Sow |
| December | Transplant Outdoors Direct Sow |
Growing Conditions
☀️ Sun
Full Sun (6-8+ hours)
💧 Water
0.5"/week · Natural rainfall sufficient
📅 Days to Maturity
45–60 days
🧪 Soil pH
Needs 6–7.5 · Your soil: too_acidic
🗺️ USDA Zone
Zone 9b
📆 Growing Season
325 days in Hernando County
Growing Tips for Sweet Alyssum in Hernando County
Direct sow Sweet Alyssum outdoors after January 25 in Hernando County when soil has warmed and frost danger has passed.
Sandy soil in Hernando County dries quickly — mulch Sweet Alyssum 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 Sweet Alyssum and water deeply in the morning.
Your generous 326.0-day season in Hernando County allows multiple plantings of Sweet Alyssum. Sow every 22.0 days for continuous harvest.
Common pests for Sweet Alyssum in this region include cabbage worm and flea beetles. Use row covers early in the season and inspect plants weekly.
General growing tips
Surface-sow seeds — they need light to germinate. Direct-sow as soon as soil can be worked in spring; in zones 7+ also sow in fall. Thin to 6 inches apart. Shear back hard in midsummer when heat causes dormancy — plants recover and re-bloom when cool weather returns. Self-seeds prolifically; allow a few plants to set seed for a perpetual colony.
Companion Planting
Good Companions
Check more plant combinations with our Companion Planting Checker →
Sweet Alyssum in Other Locations
Frequently Asked Questions
When should I plant Sweet Alyssum in Hernando County, FL?
Hernando County is in Zone 9b with an average last frost of January 25. Plan your Sweet Alyssum 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 Sweet Alyssum in Hernando County, FL?
In Hernando County, FL, plant Sweet Alyssum 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 Sweet Alyssum?
Hernando County sits in USDA Zone 9b. Sweet Alyssum grows reliably in zones 3a through 11b, so it's a good fit here.
Can Sweet Alyssum grow in Hernando County's climate?
Yes — Sweet Alyssum 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.