Perennial
Swamp Rosemallow
Hibiscus grandiflorus
Varieties We Carry
StandardHibiscus grandiflorusGrandiflorusHibiscus grandiflorus
Sizes & Pricing
1 galFrom$7.95
Fresh this week. Last restocked Mar 11.
LightFull Sun
WaterHigh
Mature size6-15 feet × 4-8 feet
About Swamp Rosemallow
Swamp Rosemallow (Hibiscus grandiflorus) is a native Florida perennial producing some of the largest flowers in the genus — enormous pale pink to white blooms with a deep crimson eye, borne on tall, robust stems. It is native to swamps and wet flatwoods across the Southeast and is spectacular in bloom. Starting at $7.95.
Plant details
- Bloom Season
- Summer
- Flower Color
- Pink, White
- Growth Rate
- Fast
- Foliage
- Deciduous
- Soil
- Loam, Clay, Wet
Best planting months
Recommended forZone 9b · St. Augustine, FL
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This monthGood windowOther months
Seasonal care
Bloom season. New foliage emerges. Good planting window.
Bloom season. Higher water demand in summer heat.
Foliage may begin to change or drop. Ideal planting window.
Dormant — drops foliage.
Care essentials
Light
Swamp Rosemallow requires full sun — at least 6 hours of direct sun per day — to produce its spectacular blooms in NE Florida. Insufficient light results in reduced flowering and weak stems that may need staking.
Water
Thrives in wet to moist soil; it is native to swamps and wet flatwoods. Plant in rain gardens, pond margins, or low spots that retain moisture. In drier sandy soils, water deeply and frequently; it will wilt dramatically under drought stress.
Soil & Fertilizer
Prefers moist, fertile loam or clay; tolerates wet and semi-aquatic conditions. Amend sandy NE Florida soils with generous compost. Apply a balanced slow-release fertilizer in spring as new growth emerges; top-dress with compost annually to maintain soil moisture and fertility.
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Common questions
Is Swamp Rosemallow a good plant for St. Augustine?
Swamp Rosemallow is a perennial for Zone 9b coastal Florida gardens, reaching 6-15 feet × 4-8 feet.
Care information verified from
Last reviewed March 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.