25 December 2012
Tuberous Begonias - A Christmas Gift
Tuberous begonias need bright, indirect light all day, but a little morning sun or late afternoon sun is fine. They like evenly moist, well drained soil. They do not like the soil to dry out. Begonias want a little dormancy in the winter, so cut back on watering in the winter. They are also frost-tender, so keep them out of freezing or near-freezing weather.
In spring, begin fertilizing with a diluted, complete liquid fertilizer every two weeks, or once or twice with a slow-release fertilizer at the beginning of the growing season.
Make sure begonias have good air circulation, but keep them protected from wind. Sometimes poor air circulation leads to a fungal disease called powdery mildew. As its name suggests, it will look like a white powder covering the leaves. As a preventative, you can spray a mixture of one tablespoon of baking soda per one gallon of water once a week. Once the fungus develops the only treatment is a commercial fungicide.