Rose of Sharon shrubs need well-draining soil and regular watering in times of drought. Yellowing or browning leaves, dropping buds, wilting plants, or stunted growth problems with althea oftentimes are caused by improper drainage in the planting site. Rose of Sharon shrubs can be sensitive to drought or waterlogged soil. Aphid honeydew attracts ants and other insects but also traps fungal spores on their sticky surfaces, leading to fungal infections of plant tissues, specifically sooty mold.įrogs, toads, and ladybugs are excellent allies in keeping insect pest populations under control. Not only do they quickly infest a plant and suck it dry, but they also leave behind a sticky honeydew. The galls disrupt the plant’s ability to take up water or nutrients, causing the aerial parts of the plant to slowly die.Īphids are a troublesome pest of many plants. These nematodes cause knots or galls to form on the underground roots of rose of Sharon. Root knot nematode damage may appear as wilting or drying up plants. Systemic insecticides can help prevent many of these pests when applied annually in spring. Some other common pests of rose of Sharon are root knot nematodes and aphids. One of the most troubling rose of Sharon problems, these pests can cause large holes or leave nothing but skeletonized remains. Unfortunately, Japanese beetles are also very attracted to the lovely blooms too. Besides gardeners, these blooms are attractive to bees, butterflies, and hummingbirds. Depending on variety, these blooms come in a wide range of color and may be single or double. Rose of Sharon shrubs are much loved for their large, prolific, tropical-looking blooms in late summer. About Rose of Sharon Pests and Diseasesīoth pests and diseases can afflict rose of Sharon plants at any given time. Continue reading to learn about common rose of Sharon pests and diseases. In this article, we will discuss common althea plant issues. However, like any other landscape plants, rose of Sharon can experience problems with specific pests or diseases. Rose of Sharon, or althea shrubs as they are commonly called, are usually low maintenance, reliable bloomers in zones 5 through 8.
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