Wondering how to grow hardy hibiscus? You’re in the right place! These fast-growing herbaceous perennials are becoming increasingly popular in gardens across the US, and it’s not hard to see why: with enormous, eye-catching blooms and a low maintenance habit, it will quickly become one of your favorites. Read on for all the tips you need to get the best out of your hardy hibiscus.
What are Hardy Hibiscus?
Hardy hibiscus (pronounces hi-BIS-kiss), also called rose mallow, are tropical flowering plants that grow 3 to 8 feet tall and 5 feet wide. Native to the USA, these perennial plants have red, white, pink, or bicolored blooms and triangular leaves with saw-tooth notches. Attractive to butterflies and hummingbirds, they’re deer resistant and bloom from late July right up to frost.
How to Grow Hardy Hibiscus
Hardy hibiscus do best in moist soil that is rich in organic matter. But they will also grow in average / medium to wet soil. Their preferred soil pH should be 6 to 7. When choosing a planting spot, avoid windy locations or use a stake or cage to hold them upright. They like full sunlight and good air circulation and need regular, deep watering. In the first season, follow a regular watering schedule to set deep roots. Afterwards, regular moderate watering will do. In extreme heat, water more often; if the soil dries out, leaf scorch sets in.
Maintaining Your Hardy Hibiscus
Hardy hibiscus are very low maintenance. Similar to daylilies, rose mallow flowers last only one day. Deadhead old blooms promptly. For the best blooms, fertilize every 14 – 20 days with Jack’s Blossoms Boost. Hardy hibiscus will come back every year in zones 4 – 9. Stems need to be cut down in the late fall for new spring growth. Hardy hibiscus responds to pruning before flowering to create fuller plants. This may also help avoid early Japanese beetle damage.
How to Use in the Garden
Hardy hibiscus is a great choice for rain gardens, borders or large pots. If you live in an area without frost, they will stay green year-round. Looking for design ideas? Try planting it with baptisia, coreopsis, or coneflower.
Ready to try growing these gorgeous blooms? Check out our collection of hardy hibiscus and get growing!