Begonia Corella ( Corella Begonia )
Begonias are tender perennials, grown for their colorful flowers and foliage. Most begonias can be grown outdoors in pots, in the ground, or in hanging baskets in filtered light and moist, but well drained soil. Where not hardy, grow as annuals or indoors as houseplants. Most begonias can be propagated from leaf, stem or rhizome cuttings in addition to being sown from seed. ‘Corella’ is a bushy begonia that has attractive foliage with small, bare leaves. The flowers are yellow to white, blooming in summer. Stemming is upright and zig-zags between the nodes. This plant enjoys filtered light but can take some sun in winter. Soil should ideally be moist. Begonias grow very well in peat-based compost also. Likes humidity. Does not like cold weather. Pinching tips and pruning outer stems in the growing season gives a bushier plant, good for hanging. Sudden temperature change causes leaves to drop.
Rhizoctonia is a fungus that is found in most soils and enters the plant through the roots or the stem at soil level. Prevention and Control: First of all, do not overwater and if you suspect Rhizoctonia may be your problem, decrease watering. If a plant is too far gone (all the leaves from the bottom up are wilted), remove it. If your plant is in a container, discard the soil too. Wash the pot with a 1 part bleach to 9 parts water solution. Fungicides can be used, according to label directions. Consult a professional for a legal recommendation of what fungicide to use.