How to Grow Swamp Hibiscus
Swamp hibiscus (Hibiscus coccineus), also called scarlet hibiscus, is a fast-growing perennial flower hardy in U.S. Department of Agriculture hardiness zones 5 through 10. The plants grow between 4 and 8 feet tall, and have deep-green leaves similar to those of a maple tree. Bright red, 6-to 8-inch blooms appear in midsummer and continue to form until fall. Swamp hibiscus prefers full sun and evenly moist soil. It can be started from seed after the last frost in spring. Does this Spark an idea?
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Instructions
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Puncture each swamp hibiscus seed with a needle to improve the chance of germination.
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Clear the growing location of all weeds and grass. Loosen the soil 5 to 6 inches deep with a garden fork.
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Sow the seeds 1/2 inch deep, and water until the soil feels very moist but not drenched.
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Keep the soil lightly moist during the first growing season. Water only during very dry conditions, once the plants are well-established.
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Thin the seedlings when they are 3 to 4 inches tall, leaving a space of 24 to 36 inches between each.
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Pull weeds from around the swamp hibiscus plants often, especially when the seedlings are small.
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Feed each week, from early spring until fall, with water-soluble fertilizer.
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Stake the plants if they begin to lean.
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Clip off faded blooms and unsightly foliage regularly.
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Tips & Warnings
Plant swamp hibiscus in a location protected from high winds.
References
- Photo Credit Comstock/Comstock/Getty Images
