Causes of Crisping Leaves in Rex Begonias

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Few plants can top begonias Begonia spp. Many types grow as annuals or houseplants, while some can grow outdoors year-round. These include tuberous begonias Begonia x tuberhybridawhich grow outdoors year-round in U.

Department of Agriculture plant hardiness zones 9 through Begonias are usually easy to grow, but occasionally a disease or cultural problem might cause leaves to turn yellow and eventually shriveling and falling from the plant. Identifying the cause is the first and most important step in correcting a problem and restoring the plant's health. It's possible that yellowing of leaves on an outdoor-grown begonia signals a natural slowing of growth at the end of the season, when foliage gradually dies back and drops from the plant.

If you're growing a begonia as a houseplantit might also slow growth as fall approaches, with a few yellowing leaves that drop from the plant as it enters partial dormancy.

Reduce watering during this period and, when foliage has mostly died, cut back the stems to about 3 inches, using shears you wipe with rubbing alcohol between cuts to prevent spread of plant disease.

New leaves usually appears in a few weeks, indicating the plant's resuming its growth. A number of fungal begonia leaves turning brown can attack a begonia, causing changes that include spotting or yellowing of leaves and eventual leaf drop.

Fungal problems include gray moldwhich causes soft, yellow-to-brown spots on leaves, where grayish fulffy mold accumulates, and powdery mildewwhich produces puffy white begonia leaves turning brown on upper and lower leaf surfaces, with begonia leaves turning brown eventually turning yellow and drying up. Another fungal disease called Pythium root rot can result in overall poor growth of a begonia, with leaves that wilt, turn yellow and slowly die.

In this disorder, the entire plant may appear stunted, and stems begonia leaves turning brown become soft and soggy; the plant might die if the problem is severe. These fungal problems develop in overly moist conditions and are best prevented by spacing plants well apart for good air circulation, watering only when the soil feels dry at the surface and allowing a potted plant to drain well after watering.

Begonias are susceptible to several other diseases that can manifest themselves by yellowing of leaves. These include bacterial leaf spot and blightwhich cause begonia leaves turning brown spots surrounded by yellow halos on leaves. Removing infected leaves may cure a minor problem, but it's best to inspect begonia leaves turning brown carefully for signs of this problem before making begonia leaves turning brown purchase.

Clearing debris from under the plants and keeping foliage dry when watering can also help keep the disease from spreading; for a severe infection, discard the plant. A plant virus can also cause leaves on begonia plants to develop pale yellow rings or spots and might also lead to overall yellow mottling on leaves. No cure exists for these viral diseases, so infected plants are best discarded.

Yellowing or wilting begonia leaves turning brown have a few other possible causes. For example, too little water can interfere with a plant's begonia leaves turning brown to carry out photosynthesis, causing leaves to turn pale green, then yellow. To prevent this, water the begonia whenever the top of its soil feels dry to the touch; for a potted begonia, never let the soil dry completely, which puts extreme stress on the plant. Begonias also attract several pests that could cause yellowing, wilting or drying of leaves.

These include thripstiny insects that produce reddish-brown streaks on leaf undersides, and spider mites, which produce visible webs on leaves.

Control these by spraying plants with insecticidal soapdiluted at a rate of 5 tablespoons per gallon of water; repeat as needed every two weeks.

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Consider using plants with colorful variegated foliage indoors this winter, Jennifer Schultz Nelson, a University of Illinois Extension horticulture educator, recommended. This additional light is required for the variegation to develop.

Even though they need more light, typically they need far less light than most flowering plants do. One group of plants with an incredible level of diversity in foliage color and pattern is the rex begonia. These plants are grown specifically for their foliage. They do flower, but the flowers are usually not very showy. Their colorful displays make the extra care worthwhile. And the extra attention will likely benefit your other plants as well.

This can be hard to achieve in homes during the winter. Running a humidifier in the room is another option, one that will probably benefit your other houseplants, as well as the human residents of your home! While they thrive in high humidity, begonias will not tolerate wet feet. In fact, if kept wet too long, they will probably succumb to mildew and botrytis, both fungal diseases related to excessive moisture which turn your plant into a mushy rotten mess.

Learn to inspect your plants and assess whether they need water, no matter what the calendar says. Rex Begonias need bright, but indirect light. Direct, hot sunlight will bleach out their brilliant colors. Morning or late afternoon filtered sunlight is acceptable.

Rex Begonias need temperatures higher than 60 degrees and thrive at temperatures around 70 degrees during the day. Rex Begonias are relatively slow growers, but benefit from using a balanced fertilizer during the growing season to maximize color development in the foliage. University of Illinois Extension. Home Current Issue Archive Podcasts. Rex Begonia Consider using plants with colorful variegated foliage indoors this winter, Jennifer Schultz Nelson, a University of Illinois Extension horticulture educator, recommended.