Elatior begonias (Begonia x hiemalis) adorn homes across much of the United States, as these flowering plants are available year-round from florists and greenhouses. Typically grown as a summer annual, this plant can be grown outside in a sheltered location where temperatures range from 50 to 75 degrees Fahrenheit.
Elatior begonias thrive in African violet soil mix, but you can make your own. Mix 2 parts potting soil, 2 parts leaf mold, 1 part perlite and one part aquarium charcoal. Add a handful of fir bark to the mixture and mix well. Moisten the mixture before using.
Elatior begonias prefer bright, indirect light. When grown inside, place the plant near an east, west or southern window out of direct sunlight. Foliage scalds easily in the sun, and overheating may damage these tender plants. Place your begonia in a shaded location outside once nighttime temperatures remain above 50 degrees Fahrenheit.
Fertilize begonia elatior every two weeks during the winter with a lime-free water-soluble fertilizer. Increase fertilizer to once a week during the summer when the plant is actively growing. Plants grown in containers typically require frequent applications of fertilizer, as nutrients leach through the soil with each watering. Always water your plants before applying fertilizer to reduce the risk of injury to the roots.
Elatior begonias prefer evenly moist soil that does not dry out between waterings. Check the soil often to determine the best routine for your plant. They may require daily watering during hot spells -- especially if summered outside. To check the soil, insert your finger into the soil to a depth of 1 inch. If the soil feels dry, your begonia needs watering.
Cut Elatior begonias back to a height of 2 to 4 inches after blooming. This forces a new growth and revitalizes the plant. A new flush of blooms typically follows within a few weeks. Rooting cuttings in a vase of water or moist sand produces new plants identical to the original. Pot the cutting in individual pots once roots are 1 inch long.
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