Floss Flower Ageratum
Ageratum houstonianum
Not currently listed at our partner nurseries.
Essentials
At a Glance
Plant Type
Annual
Height
12 inches
Width
12 inches
Light
Full Sun, Partial Sun
Water
Moderate
Humidity
Average
Lifespan
Tender perennial, grown as an annual
Native To
Mexico and Central America
Toxicity
Mildly toxic if ingested
The Story
Plant Bio
Ageratum houstonianum, commonly known as floss flower, is a tender perennial but often grown as an annual. This plant produces soft, fluffy flowers that are available in shades of blue, lavender, and white.
Uses & Benefits:
Marketplace
Where to Buy
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Planting
How to Grow
- Tuck seeds just below soil surface in early spring.
- Mist cuttings regularly to maintain humidity.
- Transplant seedlings after last frost when they are sturdy.
- Space plants 12 inches apart for optimal growth.
- Water consistently, keeping soil moist but not waterlogged.
- Deadhead faded flowers to encourage more blooms.
Pro Tip
Use well-draining soil and avoid overwatering to prevent root rot.
Keep It Thriving
Care Guide
Do
- Water regularly to keep soil moist 🌱
- Deadhead spent flowers to promote continuous blooming
- Provide full sun for best flowering
Don't
- Avoid overwatering, which can cause root rot ❌
- Do not plant in heavy, poorly-drained soil
- Avoid excessive fertilizing late in the season
Seasonal Care Calendar
| Task | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Deadhead | ||||||||||||
| Fertilize | ||||||||||||
| Plant |
Watch Out For
Pests & Diseases
Common Pests
Common Diseases
In the Garden
Landscape Uses & Companions
Landscape Uses
Companion Plants
Multiply
Propagation Methods
Good to Know
Common Questions
Floss Flower Ageratum questions
What zones can Floss Flower Ageratum grow in?
Floss Flower Ageratum is hardy in USDA Zone 10. Inside that range it survives winter in the ground; outside it, grow it as an annual or a container plant you protect.
Is Floss Flower Ageratum deer resistant?
Yes — Floss Flower Ageratum is rated deer-resistant. Deer typically pass it over, though extreme hunger can override any plant's defenses.
When does Floss Flower Ageratum bloom?
Floss Flower Ageratum typically blooms in summer to fall through late summer. Exact timing shifts a week or two with your zone — Sow's bloom calendar maps it to your garden.
Does Floss Flower Ageratum need full sun?
Floss Flower Ageratum does best in full sun to part shade. In hot climates, afternoon shade keeps blooms fresher longer.
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Grow Floss Flower Ageratum with confidence
See it in a design of your actual yard, get zone-matched care reminders, and track it season by season in your garden journal.
