Annual
Delphinium
Delphinium
Monrovia® varieties
Varieties We Carry
StandardDelphiniumDiamonds BlueDelphinium grandiflorumAssortedDelphinium
Sizes & Pricing
1 galFrom$6.95
2 galFrom$16.95
3 galFrom$19.95
Seed PackFrom$4.69
Fresh this week. Last restocked Jun 25.
LightFull Sun
WaterModerate
Mature size2-6 feet × 1-2 feet
About Delphinium
Delphinium is a cool-season annual in Northeast Florida (Zone 9b), grown for its tall spikes of intensely colored flowers in blue, purple, pink, and white from late winter through spring. Plant in fall for best results and remove when summer heat sets in; it cannot withstand Florida's heat and humidity and is not hardy in Zone 9b. Starting at $6.95.
Plant details
- Bloom Season
- Winter, Spring
- Flower Color
- White, Yellow, Pink, Purple, Blue
- Growth Rate
- Fast
- Foliage
- Deciduous
- Soil
- Loam, Well-drained
Best planting months
Recommended forZone 9b · St. Augustine, FL
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Seasonal care
Bloom season. New foliage emerges.
Active growing season.
Foliage may begin to change or drop. Ideal planting window.
Dormant — drops foliage.
Care essentials
Light
Grow Delphinium in full sun to partial shade; at least 6 hours of sun daily is ideal. In Northeast Florida, plant in fall or early winter for blooms in late winter through spring before summer heat causes plants to decline.
Water
Water regularly to keep soil consistently moist but well-drained; delphiniums do not tolerate drought or waterlogging. In Florida's mild winters, water during dry spells and ensure good drainage to prevent crown and root rot.
Soil & Fertilizer
Plant in well-amended, fertile, well-drained loamy soil. Fertilize at planting and monthly during the cool growing season with a balanced fertilizer. Remove plants when summer heat arrives — they do not survive Florida summers.
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Common questions
Is Delphinium a good plant for St. Augustine?
Delphinium is a annual for Zone 9b coastal Florida gardens, reaching 2-6 feet × 1-2 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.