This document printed from the University
of Illinois Extension Garden Column at http://www.extension.uiuc.edu/williamson/
Add Color to Your Garden with Hiemalis Begonia
April 22, 2009
Ed Billingsley
County Extension Director, Williamson County and Interim County Extension Director, Jackson County
Williamson County Unit 1306 N Atchison Ave, Ste A
Marion, IL 62959
Phone: 618-993-3304
FAX: 618-997-1542 edb@illinois.edu
Rieger Begonia
The Hiemalis begonia, also known as Rieger begonia, is a cross between a tuberous and a wax begonia.
This plant grows 12 to 18 inches tall and will get 10 to 12 inches wide. You can use the plant in baskets, pots or beds.
It is easy to appreciate this colorful plant as its season-long flowering takes the garden display to a higher level. The leaves of this plant are waxy, glossy and attractive as well.
The Rieger is easy to care for. It will grow in filtered sunlight to partial shade. Partial shade is best due to less attention with water and fertilizer. This plant will tolerate slightly dry conditions but doesn't do well in wet conditions. So, avoid overwatering.
Give the plant a dose of liquid fertilizer once a month. A water-soluble fertilizer such as 15-30-15 works great. Trim off long stems to help keep the plant compact and reduce the leggy look. An increased bloom will be obtained by removing spent flowers.
The Hiemalis begonia should have few problems with diseases or insects. Keep the leaves dry while watering to reduce the threat of powdery mildew.
The begonia does not tolerate frost so bring it indoors if frost is in the forecast. The plant can be moved into the house as winter approaches. As the plant begins to fade, stop watering for a couple of weeks. Prune the plant back to three to five nodes and then water it. New sprouts should begin to show at the base. Before long, the plant is in full bloom again.
This annual flowering plant will make any garden corner amazingly bright. So if your garden needs some endless flowers, add Rieger begonias.