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Hibiscus for Your Summer Garden

Hibiscus for Your Summer Garden

Caribbean vacationers returning to harsher climates fondly recall those spectacular Hibiscus flowers that are ubiquitous and bloom so profusely in the tropics. Of course those tender tropical beauties won’t survive our New England winters outdoors (although they can make wonderful houseplants). But don’t despair—there are two types of Hibiscus well suited to enjoy in your yard here at home as pleasing reminders until your next trip south. The numerous cultivars of Rose-of-Sharon (sometimes called “Althea”, botanically Hibiscus syriacus), along with “hardy Hibiscus” (Hibiscus moscheutos cultivars) add colorful extended flowering times, adaptability and summer garden interest for most every Northeast garden. 

Growing to 12 ft. high, Rose-of-Sharon (Hibiscus syriacus), produces continuous bloom from early July, often until frost, a far longer flowering period than most other woody shrubs. Flowers are 3-5” diameter, opening every day for many weeks along the stems. Cultivar colors range from pure white to pink, red and blue, and flowers can vary from single to double. Some newer cultivars including ‘Lil Kim’ and ‘Pollypetite’ are more compact growing, well suited for smaller gardens, and one (‘Sugar Tip’) features variegated leaves. 

Hardy Hibiscus plants (Hibiscus moscheutos cultivars) are perennial herbaceous shrubs that rapidly reach 4-6 ft. high & wide by the end of summer, then die-back to the ground each winter. Starting around July, each branch produces a profusion of huge pink, white or red flowers, depending upon the cultivar; in a sunny location with sufficient fertility and moisture, individual blooms can be 12” diameter—considered by many to be even more spectacular than those tropical Hibiscus!

Because it’s a dense and vigorous woody shrub, Rose of Sharon is a fine choice for hedging and creating private outdoor rooms around your home. It tolerates shearing and sets flowers on new growth, so pruning at any season is acceptable. And even though it drops all foliage in winter and is less view-blocking than an evergreen screen, its thickly-held branching functions effectively as a windbreak. Nearly pest-free, it performs best in full sun, but will adapt to most any soil or light condition around the yard except full shade. It can be trained to grow in a tree-form by periodically removing lower branches.

Foliage on both types of Hibiscus emerges later than most plants to begin growing in spring. Hibiscus syriacus foliage usually waits until May to appear, so be patient. Hibiscus moscheutos is herbaceous, dying back to the ground each winter, its new stems sometimes not emerging until June. 

Be on the lookout for unwanted seedlings that some Rose-of-Sharon cultivars may produce. These volunteer seedlings are easy to recognize when they germinate, and they are readily removed by pulling them up when young. Left to grow, they can develop into new plants with flower colors that differ from their parent. Most homeowners agree that this bit of maintenance is well worth the value these exciting Hibiscus plants contribute to the enjoyment of their summer gardens.

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