Varieties We Bring In
Grandiflorus
We received some Swamp Rosemallow on Jul 19, 2026.
We bring this in seasonally, so what is on the lot changes week to week. A received date shows when it last came in, not that it is here today.
Call (904) 471-0440 to confirm this plant and size before you make the trip.
Last received Jul 19, 2026.
We bring this in seasonally, so what is on the lot changes week to week. A received date shows when it last came in, not that it is here today.
Call (904) 471-0440 to confirm this plant and size before you make the trip.
Pet toxicity: Non-toxic to dogs and cats
Pet safety guideAbout 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.
Plant details
- Bloom Season
- Summer
- Flower Color
- Pink, White
- Growth Rate
- Fast
- Foliage
- Deciduous
- Soil
- Loam, Clay, Wet
Best planting months
Recommended months: March, April, May, September, October, November.
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
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.
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.
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.
Similar needs
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Shares 5 of the same needs: full sun, high water, loam, zone 9a hardiness, and pollinator-friendly.
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Halberdleaf Rosemallow
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Lizard's Tail
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Common questions
Is Swamp Rosemallow a good plant for St. Augustine?
Swamp Rosemallow is a perennial. Mature size: 6-15 feet × 4-8 feet. Light: Full Sun. Water needs: High. Swamp Rosemallow is native to Florida. Recorded hardiness zone: 9a.
What is the recorded pet toxicity for Swamp Rosemallow?
Non-toxic to dogs and cats
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.