Begonia grandis, the perennial begonia

Hardy begonia grandis flower

Begonia grandis displays magnificent blooming that is abundant and spectacular.

Key facts to remember

NameBegonia grandis
Common names – hardy begonia, perennial begonia, Evan’s begonia
FamilyBegoniaceae

Type – perennial
Flowering – Summer
Height – 16 to 20 inches (40 to 50 cm)

Exposure – sun and part sun
Soil – rather rich, well drained

Planting and care are major factors ensuring better growth and flowering for Begonia grandis.

Planting perennial begonia

Begonia grandis is one of the few of its species to be hardy and to successfully cope with winter freezing. When planting your grandis begonia, ideally, you’d use flower plant soil mix or a mix of leaves and soil mix.

Growing Begonia grandis outdoors

Wonderfully cascading begonia grandis bushPlant anytime from April onwards, directly in the ground, preferably in a partly shaded spot. In the ground or in a garden box, keep a buffer space of about 12 to 16 inches (30-40 cm) from one plant to the next.

  • Begonia grandis tolerates sun if it isn’t too harsh. Morning sun or evening sun are fine.
  • It’s a plant that love cool and moist soil.
  • The richer the soil, the more abundant the blooming. Adding soil amendments upon planting, such as manure and seaweed, is very beneficial.
  • Alternate your begonias with other bulbs that flower in summer (follow link for more tips).

Propagating Begonia grandis

Begonia grandis develops bulblets in Autumn. These appear at the point where its stems split. Bulblets help the plant spread and multiply naturally.

Pruning and caring for Begonia grandis

Proper begonia grandis careThe care that begonia requires is quite easy, especially once it has settled in well. It only requires very little care, and will do just as well in a flower bed as it will in a pot, garden box or container. The only important thing is to remember to water your begonia grandis when they’re in pots, garden boxes and the like, as soon as the soil mix is dry in the surface: it needs constantly moist soil. Begonia grandis requires lots of water, even more so when grown out of the ground in containers like pots and garden boxes.

  • Remove wilted flowers regularly, since this step helps boost new flower-bearing.
  • Before winter, if you live in an area where it freezes hard, it helps to smother the base with a mulch made from dried leaves.

Learn more about perennial begonia

Native to Asia (China and Japan essentially), Begonia grandis comes in many shapes and colors. It originally developed in the wild in forest undergrowth, with lots of shade and rich soil with lots of humus.

  • The “grandis” part of the name comes from its bearing: imposing and impressive!

Considered an herbaceous plant since it has no stem, it is part of the group of plants that are typically called bushes. Its striking bright colors range from yellow to red and pink, and they’ll irradiate all the more that the begonia is made to grow in a good quality substrate.

If you’re looking for an indoor begonia, you might want to look at the elegant begonia tamaya.

Smart tip about perennial begonia

Since it needs lots of moisture in the soil, it’s a good idea to spread the right mulch for moisture to stay in the soil. Use either clay pebbles or any type of plant mulch. You’ll save on watering!


Credits for images shared to Nature & Garden (all edits by Gaspard Lorthiois):
Single flower stem by Manuel Martin Vicente under © CC BY 2.0
Cluster of flowers by Norio Nomura under © CC BY-SA 4.0
Begonia grandis leaf by James St. John under © CC BY 2.0