Ageratum
Ageratum houstonianum
Varieties We Bring In
Last received Jul 19, 2026.
We bring this in seasonally, so what is on the lot changes week to week. A received date shows when it last came in, not that it is here today.
Call (904) 471-0440 to confirm this plant and size before you make the trip.
About Ageratum
Ageratum (Ageratum houstonianum) is a compact Central American annual bearing dense clusters of fluffy, powder-puff flowers in shades of blue, lavender, pink, and white. Its long bloom season and tidy mounding habit make it a classic choice for edging, borders, and container plantings. Starting at $6.95.
Plant details
- Bloom Season
- Spring, Summer, Fall
- Flower Color
- White, Purple, Blue
- Growth Rate
- Fast
- Foliage
- Annual
- Soil
- Sandy, Loam, Well-drained
Best planting months
Seasonal care
Bloom season. New foliage emerges. Good planting window.
Bloom season.
Bloom season. Foliage may begin to change or drop.
Dormant — drops foliage.
Care essentials
Ageratum grows best in full sun to part sun in NE Florida. Full sun produces the most blooms; in the hottest summer months some afternoon shade can extend performance. Plant in fall or early spring to take advantage of NE Florida's mild, bloom-friendly weather.
Keep soil consistently moist but well-drained; ageratum wilts quickly in NE Florida's summer heat if allowed to dry out. Water at the base to avoid fungal issues, and mulch around plants to conserve soil moisture. Do not overwater — soggy soil promotes crown rot.
Plant in well-drained sandy or loamy soil amended with compost. In NE Florida, ageratum performs best as a warm-season annual planted in spring (March–May) and again in late summer (August–October). Apply a balanced slow-release fertilizer at planting and deadhead spent blooms regularly to sustain continuous flowering.
Similar needs
Alyssum
Shares 5 of the same needs: full sun, moderate water, sandy, zone 9a hardiness, and pollinator-friendly.
Amethyst Flower
Shares 5 of the same needs: similar light, moderate water, sandy, zone 9a hardiness, and pollinator-friendly.
Pansy
Shares 5 of the same needs: full sun, moderate water, sandy, zone 9a hardiness, and pollinator-friendly.
Wishbone Flower
Shares 5 of the same needs: similar light, moderate water, sandy, zone 9a hardiness, and pollinator-friendly.
Confetti Garden
Shares 5 of the same needs: full sun, moderate water, loam, zone 9a hardiness, and pollinator-friendly.
Diascia
Shares 5 of the same needs: full sun, moderate water, loam, zone 9a hardiness, and pollinator-friendly.
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Common questions
Is Ageratum a good plant for St. Augustine?
Ageratum is a annual for Zone 9b coastal Florida gardens, reaching 6-24 inches × 6-12 inches.
Care information verified from
Last reviewed February 2026. Our care guidance comes from trusted horticulture sources and decades of helping St. Augustine gardeners. Conditions here can vary dramatically from one area to the next, so come ask us and we'll tailor it to your yard.