The Swamp Rose (Hibiscus moscheutos) is a multi-stemmed perennial that grows up to 7 feet tall. Also known as Rose Mallow, the flowers of this species are up to 6 inches across (some hybrids produce 12-inch flowers). They attract hummingbirds and butterflies, and cut stems survive a long time out of water.
Swamp Roses are best placed in the back of a garden where they can grow to a large size and not be in the way. There are a few varieties bred for dwarfness and those would be suitable for large pots and smaller gardens. They are hardy to zone 5, and in gardens colder than that the roots can easily be mulched for extra protection. Below zone 4 the roots should be dug and brought to a cool place like a garage or unheated basement.
Swamp Roses like moist, rich soil and lots of sun. Water regularly and deeply during summer. A 2-inch deep mulch helps to retain moisture when it is dry. Make sure that you don't fertilize after summer ends. Instead, allow the plant to slow its growth as it goes into winter. Deadhead old flowers and seedpods to lengthen the blooming period.
Japanese Beetles like these plants. Caterpillars don't do much damage to these and a few leaves with holes in are not a big deal.
Climate Tips for Growing Swamp Roses
In high-rainfall areas, it's a really good idea to plant Swamp Roses where their crowns will be well drained. Also, leaving the stems over winter is better than cutting them down, because the hollow stems will often fill with rain and rot the all-important crowns out.
In areas with short summers, Rose Mallows must be situated in the warmest, sunniest place possible. The hybrid 'Disco Belle' is the earliest blooming type, so attaining some of these plants will better your chances of blooms in short-season areas.
Propagating Rose Mallows
The easiest and most immediate way to propogate Rose Mallows is to divide them. This is best done in early spring, just as the sprogs begin to show above soil level. Seeds also work very well, but in short growing seasons you may find that you don't get any mature seeds. Also, hybrids may not grow true to their heritage but revert to a more basic form. If you do get seeds, it's best to sow them in late winter in a warm greenhouse or window sill. A 24-hour soak in water will help. The large seeds sprout rapidly and are easy to grow on. Transplant to individual large pots when they have a few true leaves and set out in the garden when all danger of frost has passed.
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