Hardy begonia

Hardy begonia (Begonia grandis) is the only species of begonia which is winter hardy in USDA zones 6-9 (zone 5 with protection). This shade-loving perennial grows 18 -24 inches high and wide, and displays a well-branched mounding habit. Foliage is medium to olive green above and reddish green with red veining beneath. Leaf shape is similar to angel wing begonia. Sprays of pink ¾ to 1 inch flowers rise above the foliage from early summer to fall.

Hardy begonia grows best in open shade. It thrives primarily in moist, humus-rich, well-drained soil where it mixes among other leafy shade garden favorites such as hostas (Hosta spp.), lungworts (Pulmonaria spp.), brunneras (Brunnera spp.), and ferns. A back-up irrigation plan in the hot summer weather is a must. Mulch generously around clumps in late fall for winter protection in zones 5 and 6. Hardy begonia dies back to the ground each winter, leaving little evidence that it was ever there.

Deadheading spent flowers will extend its blooming time and reduce the probability for self-seeding. Hardy begonia also spreads by tiny bulblets which can be dug up and transplanted in the late fall to increase the bed size. Hardy begonia has no serious insect or disease problems and is rated as rabbit proof. ‘Alba’ is a white flowering form.

Unfortunately, availability of plants through nursery and garden center sources is not plentiful, but can be purchased on-line.