Gardeners grow tuberous begonias to provide blooms in shady areas of the garden where few flowering plants thrive. The plants tolerate direct sun in the late afternoon and early morning, but they prefer shade in the midday and afternoon as too much sunlight can damage the foliage.
Tuberous begonias are available in a wide variety of colors, with blossoms in white, a variety pinks and a range of warm colors from red to yellow. Some cultivars produce showy double blossoms up to 3 inches in diameter, and others produce smaller more numerous single blossoms.
Tuberous begonias thrive with regular fertilization and watering in well-draining soil. The plants are not drought-tolerant. Gardeners should plant the begonias in areas with good air circulation and provide them space as stagnant air can lead to powdery mildew. If a white powdery substance appears on the leaves, gardeners can treat them with a fungicide spray.
Native to warmer climates in South America and Africa, tuberous begonias are not winter hardy in most areas of the United States. Gardeners can grow them indoors, but the plants have a dormant period and above-ground growth dies off even in warmer temperatures. Gardeners overwintering the plants should store the tubers in peat moss away from light exposure in a cool place, ideally 40 to 50 degrees Fahrenheit.