Ageratum (Flossflower) in Zone 11a & 11b

Ageratum houstonianum

When to plant ageratum (flossflower) in zone 11b

Zones 11a and 11b share the same average frost dates in our data, so this page covers both.

Method: Start indoors: Start indoors from seed, then transplant outside. Ageratum (Flossflower) needs a head start most zones can't give it by direct-sowing alone.

Spacing: 4 per square foot (square-foot-gardening spacing). Mature height: 1-2 ft.

Ageratum, also known as flossflower or blue mink, is a fuzzy-textured filler flower that's a classic choice for the back of a bed or a mass planting, needing no pinching or staking along the way.

How ageratum (flossflower) fits zone 11's season

Zone 11b is frost-free in this dataset, so frost is not what limits the calendar here. What you can plant, and when, comes down to summer heat and daylength instead.

Good companions

No standout companions recorded yet for Ageratum (Flossflower).

Where to buy ageratum seeds

• Botanical Interests
• True Leaf Market
• Burpee
• High Mowing Organic Seeds

See why we recommend these suppliers →

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See it growing

Search YouTube for "growing ageratum (flossflower)" videos → (a live search, not a hand-picked video; results vary and aren't vetted by us)

← Back to the full zone 11b calendar · Full companion planting guide · Full plant profile · Plan your beds in the Garden Designer →

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Growing Ageratum (Flossflower) in USDA zone 11b: when to start seeds indoors, when to direct-sow, and when to expect a bloom.

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