They will stop growing when temperatures dip below 58°F (14.4°C). The lowest temperature at which it can survive the winter is plus fifteen. To control an outbreak, simply soak a cotton ball, cotton swab, or artist’s paintbrush in alcohol and dab the mealy bugs off the plant. The lowest temperature at which it can survive the winter is plus fifteen. When conditions are warm inside, Rex begonias are susceptible to a mealy bug infestation. Foliage color may fade under low light conditions. Use an organic water soluble houseplant fertilizer once every four to six weeks through spring and summer. by InterMari July 2, 2018. They like humidity and warmth, but can’t tolerate extreme heat, dryness or frost. To really play up the unique qualities of begonia rex, pair them with solid green plants with different textures or forms. Rex begonias are sensitive to temperature and humidity changes. Control the problem by removing infected leaves, watering correctly and not getting the foliage wet. Begonia maculata, or Polka Dot begonia as it’s often called, is a splashy show-stopper that looks fantastic with it’s olive green leaves and contrasting spots. All rex begonias include the wild species B. rex in their parentage. Problems associated with ingesting the plant, especially the underground portions, include kidney failure, drooling and vomiting. How to Care for an Escargot Begonia Plant. Escargot begonias (Begonia rex) are a variety of rex begonia that produces spiral-shaped foliage that curls around at the base of the leaf. Native to tropical regions, as houseplants, Rex Begonias are good-natured - they are as easy to care for as they are easy on the eyes. The soil should be porous. Begonia Rex loves warmth. Although a blooming plant, its flowers are so small … Rex Begonia Plant – Care, Growing, Watering, Propagation read more » Powdery mildew is another common fungal problem that can affect Rex begonias, especially if the soil is kept too moist and the foliage gets wet. If you want to give your Rex begonia a break from inside your home, just place it in a shady to partially shady location outdoors and care for it as usual. Place the pot on a humidity tray or mist the plant frequently. Avoid soggy conditions, but do not allow plants to wilt. 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. Reapply every two weeks while the plant is actively growing. Pinching the tips on younger plants helps them grow fuller too. You can cut back on water during their dormant period in the winter, watering only when the pot dries out. As far as soil goes, rex begonias like a light and airy soil. Fill the container about one-quarter full of potting mix and water to settle the soil. It’s not necessary to fertilize most plants during the winter because they’re doing less growing and many go dormant. You can keep them happy as houseplants or store them dormant over winter, as you would with other tender bulbs. Begonia rex should be watered when the soil or pot feels dry, but don’t wait until the plant starts to wilt. Although it’s doubtful you have a “jungle environment” in your own yard, those who live in frost-free locations can grow the begonia outdoors. At home, caring for begonia is quite simple. Many people collect and display several varieties. Rex Begonia Care – Temperature and Humidity. You can also fill the saucer with small pebbles and sit the pot on top, as it lifts it out of the wet conditions. And that’s without producing many flowers like other Begonia species. Rex begonias: A subgroup of rhizomatous, Rex begonias ( Begonia rex ), are widely available, sold by florists and garden centers year-round, and generally reach 12 to 18 inches tall and wide. Full sun to partial shade. Their distinct foliage makes them a popular houseplant, but they can be finicky. Begonia maculata, or Polka Dot begonia as it’s often called, is a splashy show-stopper that looks fantastic with it’s olive green leaves and contrasting spots. Give Rex begonias a diluted dose of organic, soluble food every four to six weeks during the growing season. Spread the love. Begonia Rex loves warmth. Hi, I’m Andrew, and Smart Garden Guide is my website all about indoor gardening and houseplants. Award-winning Begonia 'Fireworks' is an evergreen, rhizomatous perennial of upright habit, mostly grown for its vibrant foliage of large, bold leaves adorned with dark purple centers, purple-pink margins and iridescent silver-white between. Potting in containers that don’t drain promote root rot and eventual plant death. Thus, was the first documented discovery of Rex begonias. Their distinct foliage makes them a popular houseplant, but they can be finicky. High light refers only to bright indirect light since direct sun often burns the leaves of indoor houseplants. Despite its exotic looks, Rex begonia is actually easy to grow. This plant is susceptible to fungal infections, mainly bacterial leaf spot. If given proper care and growing conditions, all types of Rex begonias mature into plants with a dense habit of growth. Decrease fertilizing when fall arrives and stop in winter. Begonia ‘Marmaduke’ ‘Marmaduke’ forms a bushy plant up to 50cm tall, with oval yellowish-green leaves that are heavily blotched with reddish-brown, and sprays of small pale pink flowers in late spring. A Begonia Rex plant needs plenty of bright indirect light. Begonia Rex Plant Care . Propagating Rex Begonia Foliage color may fade under low light conditions. Once you’ve selected the desired Rex begonia, an appropriate pot and soil, comes the next bit of fun – planting. Expert Tip: Don’t use a potting soil, as it’s heavier than potting mixes, has a tendency to retain too much water and doesn’t have good aeration, leading to the Rex begonia possibly developing root rot. 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