Hardy perennial hibiscus add the beauty of tropical hibiscus to the garden, but can withstand cold winter temperatures that kill the actual tropical varieties. Here’s how to grow hardy hibiscus in your garden!
Perennial hibiscus have big, disc-shaped, hollyhock-like flowers that can measure up to 12 inches across. The perennial hibiscus species found in gardens are the result of hybridizing native hibiscus species, including Hibiscus moscheutos (Rose Mallow) and H. coccineus (Swamp Hibiscus). In areas that receive a hard frost, these species will die back to the ground in winter, regrowing in the spring. Dwarf varieties reach only a few feet in height, while standard varieties may grow up to 8 feet tall.
The larger, more shrub-like hardy hibiscus species, H. syriacus (Rose of Sharon), produces an abundance of smaller flowers, but grows into a much larger shrub that doesn’t die back to the ground in winter. Depending on variety, Rose of Sharon can reach up to 12 feet tall and 10 feet wide.