Perennial
Sunflower
Helianthus
Monrovia® · Proven Winners® varieties
Varieties We Carry
StandardHelianthusFloridaHelianthus floridanusSuncredible YellowHelianthus
Sizes & Pricing
1 galProven WinnersFrom$7.95
#2MonroviaFrom$34.95
3 galProven WinnersFrom$19.95
Seed PackFrom$3.39
Fresh this week. Last restocked Jun 25.
LightFull Sun
WaterModerate
Mature sizeDependent on variety × 1-4 feet (varies greatly by species)
About Sunflower
Sunflowers (Helianthus spp.) encompass annual and native perennial species suited to NE Florida. Annual sunflowers (H. annuus) produce bold blooms in summer, while native perennials such as swamp sunflower (H. angustifolius) and beach sunflower (H. debilis) bloom summer through fall and serve as top pollinator and wildlife plants. All thrive in full sun with well-drained soil. Starting at $7.95.
Plant details
- Bloom Season
- Summer, Fall
- Flower Color
- Yellow
- Growth Rate
- Fast
- Foliage
- Deciduous
- Soil
- Sandy, Loam, Well-drained
Best planting months
Recommended forZone 9b · St. Augustine, FL
J
F
M
A
M
JNow
J
A
S
O
N
D
This monthGood windowOther months
Seasonal care
New foliage emerges. Good planting window.
Bloom season.
Bloom season. Foliage may begin to change or drop. Ideal planting window.
Dormant — drops foliage.
Care essentials
Light
Sunflowers require full sun — at least 6–8 hours of direct sunlight daily. In NE Florida, site in full exposure; adequate sun is the single most important factor for strong stems and prolific blooming.
Water
Water regularly to keep soil evenly moist during establishment and active growth. Native perennial species such as swamp sunflower (H. angustifolius) tolerate wet periods; annual types (H. annuus) prefer well-drained, moderately moist soil and decline in waterlogged conditions.
Soil & Fertilizer
Sunflowers perform well in NE Florida's sandy, well-drained soils with a pH of 5.5–6.5. Annual types benefit from a balanced fertilizer at planting; native perennial species rarely require supplemental feeding once established in Florida landscapes.
Similar needs
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Hollyhock
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Abelia
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Almond Bush
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Common questions
Is Sunflower a good plant for St. Augustine?
Sunflower is a perennial for Zone 9b coastal Florida gardens, with low salt tolerance, reaching Dependent on variety × 1-4 feet (varies greatly by species).
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.