Many of the houseplant Begonias have cane-like stems that leaves sprout from. Among the first signs and symptoms that growers may notice when dealing with leaf spot on begonia is the appearance of darkened spots or “water soaked” leaves. If it is droopy or gangly, adjust the light and water. There are hundreds of cultivars of B. rex to choose among, usually classified by leaf size—small (three inches or less), medium (three to six inches), or large (more than six inches). Handle slugs and snails by placing slug bait near your plants. Begonia rex: Evergreen perennial to 30cm, with large, obliquely ovate leaves which are metallic green with a silvery zone on the upper surface, reddish beneath; panicles of small pink flowers in winter. Rex begonias have high humidity needs, requiring levels around 50 percent or more. This plant is susceptible to fungal infections, mainly bacterial leaf spot. In fall and winter, plants may undergo a natural dormancy if temperatures are low, dropping leaves and appearing dead. According to the University of California IPM Program, improper irrigation is among the most common causes of damage in plants. When watering, try not to do this - begonias are fussy and do not like wet leaves. Poorly draining soil invites fungal disease and makes it difficult for the roots to suck up moisture. Too much food will make for a scraggly plant, so pay attention and adjust the feeding to suit your variety. Water your rex begonia deeply, allowing the soil to become almost completely dry between waterings. Something is eating the leaves on my begonias and pansys, can't see any bugs, what can I spray on them? Some have suggested that Monsteras create holes in their leaves to resist the strong winds of hurricanes. Conditions: Considered perennials in tropical and semitropical climates, Rex begonias are frost tender and typically grown as annuals or houseplants in North America. By using The Spruce, you accept our, The 5 'It' Plants of 2021, According to the Pros, 10 Varieties of Begonias for Gardens and Containers, 10 Top Outdoor Garden Plants That Thrive Indoors. Most rex begonias sold today are named hybrids, although they are not always labeled as such. Why an Indoor Stephanotis Has Drooping Leaves, University of Illinois Extension: Rex Begonia, University of California IPM: Begonia — Begonia spp. Bird of Paradise plants split their leaves to allow wind through as well. The rex begonia is a native of Southeast Asia. Repotting rex begonias each spring will ensure that they have plenty of soil to grow in, but they like to be a little bit pot bound. Rex begonia offers colorful foliage and is one of the most interesting indoor plants around. Many hybrid varieties are beautiful, but they are unlabeled or mislabeled, so be sure to ask questions so you know exactly what you're buying. More popular than begonia blooms, the leaves of certain begonia varieties grow into mosaic patterns of varying colors. White Coating On Leaves Caused By Powdery Mildew Powdery mildews are caused by fungi that live on the surface cells of plants. Rex begonia hybrids have been developed to have unusual markings, leaf shapes, and colors. Begonias are plants that originate from warm, humid parts of the world like north India. Outdoors, water tuberous begonias in the garden with a drip system or a hose than drips directly into the soil. Another thing that can cause your begonia to drop leaves is attack by worms. Outdoors, where rex begonias are only hardy in U.S. Department of Agriculture plant hardiness zones 10 and 11, the plant prefers partial or even full shade, though some morning sunlight is fine. ... Rex Begonias are admired for their fabulous foliage. They will stop growing when temperatures dip below 58°F (14.4°C). They frequently have large leaves (up to 6 inches long) that are brightly colored in various shades of green, red, silver, and even purple. Remove any damaged leaves or stems and treat plants affected by insect pests with a horticultural oil and baking soda mix. Mealybugs, aphids, and caterpillars can also become a problem. © Copyright 2020 Hearst Communications, Inc. Locate the main veins on the begonia leaf and cut from the edge of the leaf all the way back to where the stem once was. Home › Forums › Gardening Discussions › Flowers & Shrubs › Holes in my begonia leaves Tagged: begonias This topic contains 5 replies, has 4 voices, and was last updated by HaroldMe 3 years, 2 months ago. Overwatering and underwatering can both cause wilted, discolored foliage. To avoid these issues, be sure your begonias are in well-drained soil and water them sparingly. 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