Ageratum Planting Guide
Growing ageratum in June
Everything below applies to ageratum broadly. For a plan that's dialled into your county's frost dates and soil, tap your location.
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How to water ageratum
Consistent moisture matters more than volume for ageratum. Little and often beats occasional drenching.
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Where to put ageratum
South-facing beds are ideal for ageratum. Shade from nearby trees or fences costs real production.
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Check your local forecast before planting
Your zone determines the exact week to plant ageratum. Pick your county below and we'll line everything up against your frost dates.
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.
Ageratum houstonianum · Flower · Asteraceae family · 60–75 days to maturity
Why it matters: If you're just starting a flower garden in your area, Ageratum is a forgiving first pick. It tolerates imperfect soil, mild drought, and the occasional missed watering. The reward: weeks (sometimes months) of continuous color.
Get Your Personalized Ageratum Planting Dates
Enter your ZIP code to see exact planting dates, soil compatibility, and growing tips specific to your county.
Where Can You Grow Ageratum?
Ageratum Growing Regions
Click any state to see the Ageratum planting schedule for that location.
Planting Dates by Zone
| Zone | Start Indoors | Direct Sow | Transplant | Bloom |
|---|---|---|---|---|
| Zone 3a | Mar 20 | May 29 | May 29 | Jul 24 – Sep 18 |
| Zone 3b | Mar 15 | May 24 | May 24 | Jul 19 – Sep 20 |
| Zone 4a | Mar 11 | May 13 | May 13 | Jul 8 – Sep 16 |
| Zone 4b | Mar 13 | May 8 | May 8 | Jul 3 – Sep 18 |
| Zone 5a | Mar 7 | May 2 | May 2 | Jun 27 – Sep 19 |
| Zone 5b | Feb 28 | Apr 25 | Apr 25 | Jun 20 – Sep 19 |
| Zone 6a | Feb 20 | Apr 10 | Apr 10 | Jun 5 – Sep 11 |
| Zone 6b | Feb 13 | Apr 3 | Apr 3 | May 29 – Sep 11 |
| Zone 7a | Feb 11 | Mar 25 | Mar 25 | May 20 – Sep 9 |
| Zone 7b | Feb 4 | Mar 18 | Mar 18 | May 13 – Sep 16 |
| Zone 8a | Jan 25 | Mar 1 | Mar 1 | Apr 26 – Sep 13 |
| Zone 8b | Jan 14 | Feb 11 | Feb 11 | Apr 8 – Sep 9 |
| Zone 9a | Dec 30 | Jan 27 | Jan 27 | Mar 24 – Sep 8 |
| Zone 9b | Dec 14 | Jan 4 | Jan 4 | Mar 1 – Aug 30 |
| Zone 10a | Nov 20 | Nov 27 | Nov 27 | Jan 22 – Aug 6 |
| Zone 10b | Nov 20 | Nov 20 | Nov 20 | Jan 15 – Aug 13 |
| Zone 11a | Nov 20 | Nov 6 | Nov 6 | Jan 1 – Aug 13 |
| Zone 11b | Nov 20 | Oct 30 | Oct 30 | Dec 25 – Aug 20 |
How to Plant Ageratum
Growing Conditions
☀️ Sun
Full Sun (6-8+ hours)
💧 Water
Moderate — regular watering
Water when the top inch of soil feels dry. Consistent moisture produces the best results.
🧪 Soil pH
6 – 7
Prefers neutral to slightly acidic soil — ideal for most garden beds.
🗺️ Hardiness Zones
Zone 3a – 11b
📅 Days to Maturity
60–75 days
Quick-growing crop. Multiple plantings per season are possible.
👪 Plant Family
Asteraceae
Rotate with other families yearly to prevent soil-borne diseases. Don't plant in the same spot where Asteraceae family crops grew last year.
Succession Planting Ageratum
Ageratum matures in just 60–75 days, making it ideal for succession planting. In a typical 180-day growing season, you can get up to 3 successive plantings by sowing every 6.9 weeks.
Your actual succession count depends on your local frost dates. Enter your ZIP code to get personalized succession planting dates for your area.
Companion Planting for Ageratum
✅ Good Companions
Check more combinations with our Companion Planting Checker →
Growing Tips for Ageratum
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.
Saving Ageratum Seeds
Recommended for Your Garden
Start seeds indoors with reusable cell trays and humidity domes.
Test your soil pH, nitrogen, phosphorus, and potassium levels before planting.
Keep your garden organized with durable, weather-resistant plant labels.
Seed Saving & Storage Guide
Most saved seeds go bad before next season. This shows exactly when to pick, how to dry, and where to store seeds from 200 plants so yours don't.
- 200 plants, step-by-step: life cycle, pollination type, isolation
- Exact temperature + humidity ranges that keep seeds viable
- Bonus: searchable Google Sheets tracker + custom GPT assistant
Ageratum by State
- Alabama
- Alaska
- Arizona
- Arkansas
- California
- Colorado
- Connecticut
- Delaware
- Florida
- Georgia
- Hawaii
- Idaho
- Illinois
- Indiana
- Iowa
- Kansas
- Kentucky
- Louisiana
- Maine
- Maryland
- Massachusetts
- Michigan
- Minnesota
- Mississippi
- Missouri
- Montana
- Nebraska
- Nevada
- New Hampshire
- New Jersey
- New Mexico
- New York
- North Carolina
- North Dakota
- Ohio
- Oklahoma
- Oregon
- Pennsylvania
- Rhode Island
- South Carolina
- South Dakota
- Tennessee
- Texas
- Utah
- Vermont
- Virginia
- Washington
- West Virginia
- Wisconsin
- Wyoming
Frequently Asked Questions
How long does it take to grow Ageratum?
Ageratum (Ageratum houstonianum) takes 60 to 75 days from planting to harvest. Exact timing depends on your variety, growing conditions, and USDA zone.
What zones can Ageratum grow in?
Ageratum can be grown in USDA zones 3a through 11b. Use the planting calendar above to find the exact dates for your zone.
How much sun does Ageratum need?
Growing Ageratum requires Full Sun (6-8+ hours), Moderate — regular watering, and soil pH of 6 to 7.