Family Begoniaceae (Begonia Family), University of Arkansas Cooperative Extension: Houseplants -- Begonia, Missouri Botanical Garden: Begonia Rex-Cultorum, University of California IPM: Water Excess or Deficiency. A rex begonia suffering from mold may have discolored leaves with soft stems or patches of gray or black mold growing on the leaves. The clumping growth habit of Rex Begonias, coupled with their tightly packed leaves, makes for a dense plant. Rex begonia requires a well draining, porous soil mix. To avoid these issues, be sure your begonias are in well-drained soil and water them sparingly. Plants will vary and the only way to know what your plant wants is to watch it, once it has adjusted to its new surrounding. A … A sunny windowsill with a thin curtain is the best type of spot. Rotating potted rex begonias will keep the plants full and stocky. When watering, try not to do this - begonias are fussy and do not like wet leaves. If it's flourishing, continue with what you were doing. Rex Begonia leaves also grow in purple, cream, pink, and silver. Some have suggested that Monsteras create holes in their leaves to resist the strong winds of hurricanes. Direct sunlight will bleach the leaves or cause sunscald, resulting in brown, dry tips or patches. It doesn’t have to be the tip of the stem: any piece of 2″ or up will work. Poorly draining soil invites fungal disease and makes it difficult for the roots to suck up moisture. In pots, be sure to provide drainage holes. There are many cultivars available with attractive coloured and patterned leaves. To really play up the unique qualities of begonia rex, pair them with solid green plants with different textures or forms. Rex Begonias are not difficult to divide and propagate, which comes in handy as individual plants usually don’t have a very long lifespan. Rex begonia offers colorful foliage and is one of the most interesting indoor plants around. In 2017, we offered a Rex begonia called ‘Jurassic Silver Swirl’ for the first time. You can feed Rex Begonias every two weeks or so using a diluted regular balanced houseplant fertilizer during the growing season (Spring through Fall). Large or gangly plants can be pruned into shape. Rex Begonia. Root rot can be a problem in wet areas. The leaves grow on short leaf stalks, from the underground rhizome. Begonia stem and root rot, also called begonia pythium rot, is a very serious fungal disease. Michelle Wishhart is a writer based in Portland, Ore. She has been writing professionally since 2005, starting with her position as a staff arts writer for City on a Hill Press, an alternative weekly newspaper in Santa Cruz, Calif. An avid gardener, Wishhart worked as a Wholesale Nursery Grower at Encinal Nursery for two years. Alternatively, if your area is too cold, consider growing yours as a houseplant or in an outdoor container that can be brought indoors in cooler weather. Rex begonias have high humidity needs, requiring levels around 50 percent or more. 5. Hi, I got this begonia rex on clearance for 1$ (i know this begonia may not even worth 1$), it has put out a new leaf but I've noticed that the new leaf and the other one leaf have a hole in the middle of the leaf. The spots are translucent and turn brown with yellowish, translucent margins. Origin: The initial species, B. rex, originated in the forests of northern India.Today, there are countless cultivars derived from this species enjoyed around the world. The rex begonia is a native of Southeast Asia. The leaf edges and undersides are covered with short red hairs. Many of the houseplant Begonias have cane-like stems that leaves sprout from. Mix 1 tablespoon horticultural oil and 1 tablespoon baking soda with 1 gallon of water. Rex begonias can be very demanding of just the right amount of water, food, and humidity. Why an Indoor Stephanotis Has Drooping Leaves, University of Illinois Extension: Rex Begonia, University of California IPM: Begonia — Begonia spp. Rex begonia (Begonia rex-cultorum) is a notoriously high maintenance frost tender perennial commonly grown indoors as a houseplant. Caterpillars and earwigs cause similar damage to slugs and snails. This is especially true for houseplants during the winter. Depending on the cultivar, the Rex begonia plant can reach from 12 to 24 inches in height and spread. Rex begonias (Begonia rex) are tropical plants, prized for their colorfully patterned and intriguingly shaped leaves. 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. Learn tips for creating your most beautiful (and bountiful) garden ever. © Copyright 2020 Hearst Communications, Inc. The varieties of begonias number in the thousands, and their popularity is quite apparent. 0. Remove mealybugs by dipping a cotton swab in rubbing alcohol and using it to wipe off the pests. Rex Begonias do bloom but the flowers pale in comparison to the amazing leaves which seem to glisten and sparkle in the light. Conditions: Considered perennials in tropical and semitropical climates, Rex begonias are frost tender and typically grown as annuals or houseplants in North America. ... Rex Begonias are admired for their fabulous foliage. According to the University of California IPM Program, improper irrigation is among the most common causes of damage in plants. 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. Rex begonias perform best with indoor temperatures ranging between 60°F to 85°F (15.5°C to 29.4°C). Plants … Marie Iannotti is an author, photographer, and speaker with 27 years of experience as a Cornell Cooperative Extension Horticulture Educator and Master Gardener, The Spruce uses cookies to provide you with a great user experience. They come in a variety of forms including those that grow canes a little like branching bamboo, clump formers and others with rhizomatous creeping roots, those with the largest leaves are Begonia rex. Several factors cause begonia leaves to fall off suddenly and rot. These evergreen perennial plants are native to the tropical rainforests in Brazil. Rex begonias have high humidity needs, requiring levels around 50 percent or more. Although they are at home in a shady garden, they are also popular as houseplants. 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. 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. It MAY be insects, but there are also other possibilities with begonias: Have you gotten your little guy's leaves wet? Begonia rex should be watered when the soil or pot feels dry, but don’t wait until the plant starts to wilt. Wishhart holds a Bachelor of Arts in fine arts and English literature from the University of California, Santa Cruz. Knowing when to water your Rex begonia is easy, although you will probably have to water weekly, especially during the growing season. 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. Causes of Crisping Leaves in Rex Begonias Humidity Help. If your rex begonia develops crispy brown leaves, its likely a sign that the plant's cultural conditions are less than ideal. You can feed your potted plants monthly with any good houseplant food. Above: Begonia rex ‘Red Tango’ mixes well with other shade- and humidity-loving plants such as asparagus ferns and geraniums. Begonias Worm Infestation. Like other begonia species and other tropical understory plants, the Rex enjoys a shaded, humid, and quiet environment to grow in. 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. Bacterial Leaf Spot (Begonia) Problem Info . Propagating Rex Begonia. Bacterial leaf spot, mildew, and botrytis can occur if the leaves stay wet. If you don't see insect pests, I wonder if slugs or snails are busy eating the leaves after dusk? There are many different varieties of Rex begonia… Fading leaves on a Begonia rex is a sign of too much direct sunlight. 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. If it is droopy or gangly, adjust the light and water. Use a commercial peat-lite potting mix, and always avoid heavy and poor-draining soil mixes. They will stop growing when temperatures dip below 58°F (14.4°C). Because it's a relatively short houseplant, Rex begonia is perfect for desks and tabletops where is wildly colorful, variegated foliage makes it a perfect contrast against other houseplants. Avoid overhead sprinkling. 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. Be sure your garden beds or containers meet the requirements of the rex begonia. Rex Begonia fertilizer. Most begonias are grown a s flowering pot plants, but the Rex begonia (Begonia rex-cultorum) is grown primarily for its brightly colored, variegated foliage. Sometimes a slimy substance oozes from the infected areas, turning light brown as it dries. How To Water A Rex Begonia Indoors. Aster Yellows is a disease caused by leafhoppers that results in spindly growth and yellow veins on young begonia leaves. Damp soil may cause fungus infection at the base of the stem, causing the plant to topple over. Among the various types of begonias, the Begonia rex are some of the most beautiful and stunning plants. If your begonias are infected, the stems become waterlogged and collapse. Also, if the soil goes from wet to dry to wet, this could cause leaf problems, too. Others suggest that they have the holes that better allow water to come in contact with their roots. Begonia rex is sensitive to temperature changes and to temperatures below about 60 degrees Fahrenheit (16 Celsius). 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