Annual
Ageratum
Ageratum houstonianum
Varieties We Carry
StandardAgeratum houstonianum
Sizes & Pricing
1 galFrom$6.95
Seed PackFrom$2.99
Fresh this week. Last restocked Jun 25.
LightFull Sun, Part Sun
WaterModerate
Mature size6-24 inches × 6-12 inches
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
Recommended forZone 9b · St. Augustine, FL
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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
Light
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.
Water
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.
Soil & Fertilizer
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.
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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.