When to plant Ageratum in Collier County, FL
Aim to plant Ageratum in Collier County on or after December 1; the window stays open through December 22. Collier County's 365-day frost-free season gives you plenty of room for a spring and fall cycle.
When to Plant Ageratum in Collier County, FL
Top priorities for Collier County, Florida gardeners in July
A quick July briefing for Collier County, Florida gardeners — what's urgent, what's next, and what can wait.
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Start harvesting ageratum
If you can't use it all right away, check the food-preservation section of your planner.
Get ahead of August
- First harvests: ageratum
Ageratum (Ageratum houstonianum), the floss flower, produces clusters of fluffy, powder-puff blooms in the rare sky-blue and lavender tones difficult to find among warm-season annuals. Compact mounding habit makes it ideal as a front-of-border edging plant. Blooms from early summer through fall with minimal deadheading; heat and humidity tolerant once established.
Collier County, Florida is in USDA Zone 10b. The average last spring frost is January 12 and the first fall frost is April 15, giving you a growing season of approximately 93 days.
At an elevation of 185 feet, Collier County receives approximately 61.3 inches of rainfall annually with predominantly sand soil. Summer highs average 85°F, providing good warmth for Ageratum during the growing season. Sandy soil warms quickly in spring — great for early planting — but Ageratum will need more frequent watering and organic matter to retain nutrients. Ample rainfall means less supplemental watering, but ensure good drainage to prevent Ageratum root diseases.
Collier County Soil Profile
Soil Type
Sand
Soil pH
5-6.2
Drainage
Well Drained
Soil Compatibility in Collier County
How your county's soil matches Ageratum's growing requirements.
Soil pH
Your soil pH (5.0–6.2) is more acidic than Ageratum prefers (6.0–7.0). Add garden lime to raise pH.
Soil Texture
Sandy soil in Collier County warms quickly in spring but drains fast. Ageratum will need more frequent watering and regular compost additions to retain nutrients.
Drainage
Drainage is adequate for Ageratum.
Organic Matter
Organic matter is low (1.3%). Add 2-3 inches of compost before planting Ageratum.
How to Plant Ageratum
Ageratum Water Budget
Monthly Watering Guide for Ageratum
Ageratum needs approximately 1 inches of water per week (4.3" per month). Here's how your county's rainfall compares month by month.
| Month | Ageratum Needs | Rainfall | You Supplement | Action |
|---|---|---|---|---|
| Jan | 4.3" | 2.8" | 1.5" | 💧 Light watering |
| Feb | 4.3" | 3.3" | 1" | 💧 Light watering |
| Mar | 4.3" | 4.1" | 0.2" | 💧 Light watering |
| Apr | 4.3" | 2.4" | 1.9" | 💧 Light watering |
| May | 4.3" | 3.7" | 0.6" | 💧 Light watering |
| Jun | 4.3" | 7.5" | 0" | ✅ Rainfall sufficient |
| Jul | 4.3" | 10" | 0" | ✅ Rainfall sufficient |
| Aug | 4.3" | 9" | 0" | ✅ Rainfall sufficient |
| Sep | 4.3" | 8.4" | 0" | ✅ Rainfall sufficient |
| Oct | 4.3" | 5.6" | 0" | ✅ Rainfall sufficient |
| Nov | — | 2.3" | 0" | ❄️ Dormant |
| Dec | — | 2.2" | 0" | ❄️ Dormant |
Water needs are for active growing months only (Jan–Oct in Collier County). Supplement amounts are based on average rainfall — actual needs vary with temperature, soil, and mulching.
Ageratum 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.
Ageratum Planting Timeline — Collier County, FL
Ageratum Planting Calendar
| Activity | When | Date Range |
|---|---|---|
| Start Indoors | December 1 | Dec 1 – Dec 15 |
| Transplant Outdoors | December 1 | Dec 1 – Dec 15 |
| Direct Sow | December 1 | Dec 1 – Dec 22 |
| Bloom | January 26 | Jan 26 – Aug 24 |
· 8" apart · Rows 10" apart
Month-by-Month Timeline
| Month | Activities |
|---|---|
| January | Bloom |
| February | Bloom |
| March | Bloom |
| April | Bloom |
| May | Bloom |
| June | Bloom |
| July | Bloom |
| August | Bloom |
| September | — |
| October | — |
| November | — |
| December | Start Indoors Transplant Outdoors Direct Sow |
Growing Conditions
☀️ Sun
Full Sun (6-8+ hours)
💧 Water
1"/week · 1-2 times/week
📅 Days to Maturity
60–75 days
🧪 Soil pH
Needs 6–7 · Your soil: too_acidic
🗺️ USDA Zone
Zone 10b
📆 Growing Season
93 days in Collier County
Growing Tips for Ageratum in Collier County
Direct sow Ageratum outdoors after January 12 in Collier County when soil has warmed and frost danger has passed.
Sandy soil in Collier County dries quickly — mulch Ageratum with 2-3 inches of straw and water deeply 2-3 times per week rather than lightly every day.
Common pests for Ageratum in this region include aphids and slugs. Use row covers early in the season and inspect plants weekly.
General growing tips
Start seeds indoors 6–8 weeks before last frost — do not cover seed; it needs light to germinate. Can be direct-sown after last frost once soil warms to 60°F. Transplant or thin to proper spacing after frost danger passes. Deadheading isn't strictly required but tidying spent clusters improves appearance. Provide consistent moisture; drought causes premature setting. Avoid deep shade — blooms best in full sun to light afternoon shade.
Companion Planting
Good Companions
Check more plant combinations with our Companion Planting Checker →
Ageratum in Other Locations
Frequently Asked Questions
When should I plant Ageratum in Collier County, FL?
Collier County is in Zone 10b with an average last frost of January 12. Plan your Ageratum planting based on this frost date — see the calendar above for exact timing.
What planting zone is Collier County, FL?
Collier County, Florida is in USDA Hardiness Zone 10b. The average last spring frost is January 12 and first fall frost is .
When should I plant Ageratum in Collier County, FL?
In Collier County, FL, plant Ageratum after the last frost (around January 1) and before the first frost (around December 31). Best results when soil holds above 50°F.
What growing zone is Collier County, FL for Ageratum?
Collier County sits in USDA Zone 10b. Ageratum grows reliably in zones 3a through 11b, so it's a good fit here.
Can Ageratum grow in Collier County's climate?
Yes — Ageratum grows well in Collier County's temperate climate. Collier County averages a 365-day frost-free season, with last frost around January 1 and first frost around December 31.
Your Collier County Garden Planner — Free
A 22-page printable planner built for Collier County (Zone 10b). Planting dates, a month-by-month schedule, harvest log, seed inventory, and succession charts — all dialed in for your exact growing season.