Generalities tuberous begonia
Belonging to the Begoniaceae family, tuberous begonia is an annual plant, native to tropical and subtropical areas, which takes its name from the type of root that distinguishes it, a large blackish tuber. Tuberous begonia has a fleshy, knotty stem and large flowers of different colors and morphologies. Distinctive signs of this plant are a strongly asymmetrical growth and the fact of being a monoecious plant, that is with male and female flowers, different from each other, present on the same plant: the male flowers are more showy and are formed by 4 oval petals, two of which are smaller; in the feminine flowers, on the other hand, the 4 petals appear equal and from them originates a winged capsular fruit, containing very small seeds.
Begonia needs regular watering, especially from March to October; however, it will be essential to allow the surface layer of the soil to dry completely between one irrigation and another. In winter, on the other hand, the tubers can remain in the pot, but they must remain dry. Particular attention must then be given with regard to drainage, as these plants fear the stagnation of water, which could cause the tuber to rot, or cause it to be attacked by mold. As for fertilizing, like all plants that produce many flowers, it needs a liquid fertilizer, rich in a greater quantity of potassium, but also nitrogen and phosphorus. The fertilizer should be administered in spring / summer, approximately every 2 weeks.Tuberous begonia: Pests and diseases tuberous begonia
Exposure to direct sunlight can cause obvious burns on the leaves; in this case, it will be immediately moved to another location. Excessive watering or too high temperatures may cause the plant to collapse: it will therefore be necessary to change its location or to reduce watering. The presence of gray mold on leaves and flowers will signal an attack of Botrytis cinerea, a fungus: it will be necessary to let the soil dry, treat the begonia with a specific fungicide and move it to an airy position, but away from drafts. The same operations will be performed in the case of a white powdery mold on the leaves, which will indicate the attack of powdery mildew, or white mal, a very harmful fungus.