Perennial
Dahlia
Dahlia
Varieties We Carry
StandardDahliaHypnotica Yellow, TrellisDahliaVirtuosa Vibrant Violet, PWDahlia variabilis
Sizes & Pricing
1 galFrom$6.95
3 galFrom$19.95
Seed PackFrom$3.99
Fresh this week. Last restocked Jun 25.
LightFull Sun (with light afternoon shade in hottest months)
WaterModerate
Mature size1-6 feet × 1-3 feet
About Dahlia
Dahlias are tuberous perennials from the highlands of Mexico and Central America offering a vast range of flower forms — from small pompons to dinner-plate blooms — in virtually every color. In Northeast Florida (Zone 9b) they are grown as cool-season plants, planted in fall for winter-to-spring blooms, and may struggle in the intense summer heat and humidity. Starting at $6.95.
Plant details
- Bloom Season
- Winter, Spring
- Flower Color
- White, Yellow, Orange, Red, Pink, Purple, Multi
- Growth Rate
- Moderate
- Foliage
- Deciduous
- 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.
Active growing season.
Bloom season. Foliage may begin to change or drop. Ideal planting window.
Dormant — drops foliage.
Care essentials
Light
Choose a location with full sun and, if possible, light afternoon shade during the hottest months; dahlias in Northeast Florida perform best with morning sun and protection from intense midday heat.
Water
Keep soil consistently moist but well-drained; water regularly and apply a thick layer of mulch to conserve moisture and moderate soil temperature. Avoid waterlogged conditions, which promote stem rot.
Soil & Fertilizer
Plant in rich, well-drained soil amended with organic matter. Fertilize on a regular schedule during the growing season with a balanced fertilizer; avoid excess nitrogen. Tubers may overwinter in the ground in Zone 9b.
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Common questions
Is Dahlia a good plant for St. Augustine?
Dahlia is a perennial for Zone 9b coastal Florida gardens, reaching 1-6 feet × 1-3 feet.
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.