Create a Long-Lasting Tropical Vibe in Your Garden with Hardy Hibiscus

If you think bigger is better, then you’ll love the oversized spectacle of hardy hibiscus blooms.  Like their tropical hibiscus cousins, hardy hibiscus adds big, beautiful, bold blooms to your garden, letting you create a gorgeous staycation space by the pool or adding instant impact in landscape beds. But unlike tropical hibiscus that whimpers and withers at the first chill, begging to be brought inside, hardy hibiscus sticks around for years, dying back to the ground in winter and reappearing each year in late spring.

So, what exactly is the difference between hardy hibiscus and their tropical relatives? And where does Rose of Sharon fit into the family tree?

Hardy Hibiscus, Tropical Hibiscus, Rose of Sharon: What’s the Difference?

It’s a little confusing, we know. While hardy hibiscus, tropical hibiscus, and Rose of Sharon share some similarities, they also grow and perform differently in the garden.

Here’s a quick overview:

For the native plant lover, hardy hibiscus is a natural choice for your garden. Commonly known as rose mallow, hardy hibiscus includes species native to North America (such as Hibiscus moscheutos and Hibiscus laevis), as well as hybrids of those species. Blooming beautifully from late spring until late summer, these plants are true perennials, withstanding temperatures to -30 degrees Fahrenheit. Most hardy hibiscus grow well in USDA hardiness zones 5 through 9.

Hardy hibiscus typically produces the largest flowers of any members of the hibiscus family—often with pinwheel-like blooms as big as dinner plates. As a perennial, it dies back to the ground each year, reappearing in late spring for another stunning seasonal show.

A sunny space with rich soil provides a great start for growing hardy hibiscus. But make sure to give your plant plenty of water, because native hardy hibiscus—like H. moscheutos, the parentage for most of the varieties you’ll find at your favorite nursery, garden center, or online retailer—grows naturally in swampy, boggy areas. Supplemental water plus full sun makes the perfect formula for happy, healthy, beautifully blooming plants.

Do you need to amend your soil?

If you’re worried that your garden soil tends toward dry, amend the bed’s soil with compost, coconut coir, or peat moss to help retain moisture—and then add a layer of mulch on the bed once you plant the hardy hibiscus. Mulch helps reduce water evaporation, maintain soil moisture, and prevent weeds. Plus, it adds a pretty, polished look to the landscape. Avoid a “mulch volcano”—spread mulch evenly to surround the plant’s crown, not piled on top of it.

Fertilize your Hardy Hibiscus for larger and more blooms! 

Hardy hibiscus grows well in a wide variety of soils, but it does benefit from fertilizer to produce the best blooms. Add a slow-release, granular fertilizer around hardy hibiscus in the spring, after the plant breaks dormancy. Supplemental fertilizer will feed the hardy hibiscus throughout the growing season.

If you grow hardy hibiscus in containers, make sure to fertilize the plant throughout the growing season, as nutrients leach out of the soil as the water drains through the container. Use a water-soluble, low-phosphorus fertilizer, like a 16-3-16 formula. Too much phosphorus causes the plant to elongate, resulting in a weaker, stretched form. The same is true for hardy hibiscus grown in too much shade—the plant will stretch toward the light, creating fewer blooms and a leggy plant.

Likewise, there’s no pruning needed throughout the season with hardy hibiscus. When the plant goes dormant in late fall, it’s beneficial to let the stems remain throughout the winter, allowing the roots to absorb energy. In the spring, trim the stems to 5 to 6 inches tall, and soon you’ll see new growth.

Wildlife Watching with Hardy Hibiscus: 

Pests on Hardy Hibiscus

But just as hardy hibiscus attract pollinators, they also attract a few pests. The more common pests you’ll want to watch for include thrips, Japanese beetles, and especially sawfly larvae. Both Japanese beetles and sawfly larvae can quickly skeletonize the plant’s leaves, so make sure to check your hardy hibiscus often for these pests.

While a few pests do enjoy hardy hibiscus, it’s surprisingly disease-resistant. Catch those pests early, and your hardy hibiscus will make the garden look brilliant until fall.

Which Hardy Hibiscus Is Right for You?

Whether you garden in a small space or a large landscape, you’ll find a hardy hibiscus variety perfect for your garden. Just make sure you look at the plant tag or online description to check its mature size. Smaller varieties grow well in large containers or petite gardens, but you’ll also find plenty of options for larger landscapes. Newer introductions offer a nice range of sizes so that everyone (with a sunny space) can enjoy hardy hibiscus.

Try these stunning, easy-to-grow hardy hibiscus varieties recommended by NGB members:

Summerific® Series

Just when many gardens are beginning to look a bit forlorn from the summer heat, Summerific® Hibiscus brilliantly bursts into action. Blooming from mid to late summer and well into fall, these stunning plants bear the largest flowers of any perennial, with buds appearing up the stems, not just at the top like older varieties. Their large size and fast growth rate make Summerific® Hibiscus an excellent specimen plant for the landscape. Plus, these are some of the toughest hibiscus, hardy down to zone 4!

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Founded more than 100 years ago, the National Garden Bureau educates, inspires, and motivates people to grow home gardens. National Garden Bureau members are horticultural experts, and the information shared with you comes directly from these experts to ensure your gardening success.

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