Begonia x semperflorens-cultorum, commonly known as Wax Begonia, is one of the most popular garden annuals grown in the U.S.. Wax Begonia is a very forgiving plant ideal for beginning gardeners. It is a long and reliable bloomer, displaying its clusters of red, pink, or white flowers from late spring until mid-autumn.
Wax Begonia flowers appear in single or double blooms in loose clusters known as cymes. Plants are compact and bushy with shiny bronze or dark green leaves bearing the waxy texture that gave the plant its common name. Depending on the variety, Wax Begonia will grow up to a foot tall with a six to 12 inch spread.
The plant's waxy leaves are more than decorative. They reduce water loss in hot weather, making Wax Begonia more tolerant of drought. And though it prefers a mix of sun and shade, Wax Begonia can also endure heavy shade, albeit with a decline in flower production.
Wax Begonia seeds are very small and dustlike and require four to six months of growth before transplanting can occur. For that reason, many gardeners buy Wax Begonia plants from nurseries.
If starting Wax Begonia from seed, do not cover the seeds with soil. Cover them with glass or plastic until germination occurs — usually two to three weeks. Maintain consistent moisture before and after germination. Transplant Wax Begonia after last frost, spacing seedlings a foot apart.
Wax Begonias will not survive year-end frost, but may be transplanted to containers and brought indoors as houseplants. Place Wax Begonias in hanging window baskets for optimum light.