how big do begonia plants get
It grows 6 inches tall and wide. Begonia 'Dragon Wing Red' offers large red flowers on big plants that can grow 18 inches tall and 12 inches wide. Begonia 'Mandalay Pearl' produces airy white blooms all summer long -- no matter how hot it gets -- and thrives in full sun.It grows 1 foot tall and 30 inches wide.alk about foolproof: Annual begonia is about as easy as it gets. It does well in a variety of conditions, but to keep it its most luxuriant best, give it light shade; rich, well-drained soil; and ample water. It also loves plenty of fertilizer, so be generous.