Who it feeds
The rose mallow bee, Ptilothrix bombiformis, collects only hibiscus pollen and nests in hard-packed soil nearby. Hummingbirds visit, and it hosts several moths including the io moth.
What it does for the place
A marsh-edge plant that tolerates salt and flooding, holds tidal banks, and blooms through August when marsh nectar is scarce.
The story
Long Island's native hibiscus, growing in brackish and freshwater marshes along both shores. The dinner-plate flowers of the garden hardy hibiscus were bred from it. Its stem fibers were used for cordage.
Worth knowing
- Each flower lasts a single day, but plants produce dozens.
- It is very late to emerge in spring; do not give up on it before June.
- Seeds float and disperse on tides.
Saving its seed
Ripe: Oct, Nov. Round capsules turn brown and split into five parts; seeds are dark and round.
Collect: Pick capsules before they shatter; shake out seed.
Sow: Winter-sow outdoors (jugs or flats) any time after the first hard freeze. Give it about 60 days of cold-moist stratification. Some growers also soak the hard seed in warm water for a day, or nick the coat, before sowing.
Cold-stratification days follow Prairie Moon Nursery's January 2026 germination codes where that nursery lists the species; others follow common nursery practice. Protocols vary with seed lot and supplier, so check your seed packet.
Seed saving calendar for your zip code →
