How Do You Keep Rieger Begonias Blooming? Temperature. Reiger begonias need average to warm (and humid) temps. They can go as low as degrees Fahrenheit at night in the fall to help stimulate a bloom. How do you maintain a begonia Rieger? Fertilize the Rieger begonia once a month with a high-phosphorous liquid plant food
How Big Do Begonia Plants Get? Begonia plants are typically under 1 foot tall, with loads of colorful flowers up to 4 inches wide. Begonias are generally hardy in zones 9 & 10, and in colder zones (2 – 8), they can be grown as annuals and overwintered indoors to grow year after year. How
Can Begonias Be Trimmed? Can begonias be trimmed? Rhizomatous and fibrous rooted begonias don’t die back but they are usually pruned annually to keep them full and blooming properly. In warm climates, begonia plant pruning is usually done in spring. How do you keep begonias short? You can cut back the stems at any time