Repotting guide

When & how to repot Palmate Begonia (Begonia palmata)

Also called Palmate begonia, Hairy begonia, Palm-leaf begonia.

More about palmate begonia

About Palmate Begonia

Begonia palmata · also called Palmate begonia, Hairy begonia · tropical

Begonia palmata is a rhizomatous species widespread across the Himalayan foothills, southern China, and mainland Southeast Asia, where it colonises shaded, moist stream banks and forest edges at moderate elevations. It is notable for its large, shallowly palmately lobed leaves covered in reddish-brown hairs, giving the whole plant a distinctive felted texture. Grow in bright indirect light with high humidity and a well-drained mix; the hairy foliage traps moisture so water only at the base to prevent rot. The ASPCA lists Begonia species as toxic to cats, dogs, and horses.

Mature size: 30–50 cm (12–20 in) tall, spreading to 40–60 cm (16–24 in) wide as a mature specimen.

Watch for — Botrytis leaf spots: The dense reddish-brown hairs trap water droplets, creating ideal conditions for Botrytis cinerea (grey mould). Always water at soil level, ensure good air movement, and remove any dead or damaged leaves promptly.

How to tell palmate begonia needs repotting

Repotting on a calendar is less reliable than reading the plant. For palmate begonia, watch for these signs:

Roots growing out of the drainage holes, or the rootball lifting the plant proud of the rim.
Soil that has shrunk away from the pot sides and no longer holds water.
The pot is unstable because the plant has grown top-heavy.
Old, compacted, broken-down mix that stays wet too long — for a succulent that is a rot risk, so refresh it even if the pot size is fine.

For the underlying biology of a pot-bound root system and why it stalls a plant, see our guide to spotting and fixing a root-bound plant.

How often to repot palmate begonia

Every 2–3 years, into bone-dry mix. Palmate Begonia's growth habit — low, spreading rhizomatous perennial with a creeping rhizome at or just below the soil surface, sending up large, shallowly lobed, densely hairy leaves on stout, hairy petioles; flowers are small, white to pale pink, produced in cymes. — sets the pace. Begonia palmata is a rhizomatous species widespread across the Himalayan foothills, southern China, and mainland Southeast Asia, where it colonises shaded, moist stream banks and forest edges at moderate elevations. It is notable for its large, shallowly palmately lobed leaves covered in reddish-brown hairs, giving the whole plant a distinctive felted texture. Grow in bright indirect light with high humidity and a well-drained mix; the hairy foliage traps moisture so water only at the base to prevent rot. The ASPCA lists Begonia species as toxic to cats, dogs, and horses.

What size pot to step palmate begonia up to

Use a pot only one size up — or even the same pot with fresh gritty mix if the roots have room. Palmate Begonia stores water and rots in a large pot of slow-drying soil. A tight terracotta pot that dries fast is far safer than a generous plastic one. Never up-pot a succulent by several sizes.

Not sure of the exact diameter? Our pot size calculator takes the current pot and root spread and tells you the right next size — it deliberately recommends a single step up, never a big jump.

The best time of year to repot palmate begonia

Spring or summer, while palmate begonia is in active growth and warm, is best — roots recover fastest then, and the plant is not sitting in cool damp soil. Avoid repotting a succulent in winter dormancy.

Step-by-step: repotting palmate begonia

Repot dry. Do not water palmate begonia for several days first. Working with dry roots and dry mix dramatically lowers the rot risk for a succulent.
Pick a snug, fast-draining pot. Choose terracotta one size up at most, with a drainage hole. Have gritty gritty, free-draining loam-based or peat-free compost ready.
Tip it out and clean the roots. Slide the plant out, crumble off the old soil, and trim any black, mushy or dead roots with clean snips.
Pot into dry mix. Set palmate begonia at its original depth in dry gritty mix, firming gently. Do not bury the stem deeper than it was.
Wait a week before watering. Leave it completely dry and out of harsh sun for about 7 days so any damaged roots callus. Only then water lightly.

Aftercare

Keep palmate begonia completely dry and out of fierce sun for about a week so any nicked roots callus before they meet moisture; watering a freshly repotted succulent is the classic way to rot it. Then resume the normal lean, dry rhythm. Do not fertilise for about 3 weeks — fresh mix already carries nutrients and feeding freshly disturbed roots scorches them.

The right soil mix for palmate begonia

Palmate Begonia wants gritty, free-draining loam-based or peat-free compost. A mix of two parts peat-free compost to one part perlite and one part coarse grit gives the sharp drainage this rhizomatous species demands. Avoid dense, moisture-retentive mixes that sour around the fleshy rhizome. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting palmate begonia — frequently asked questions

How often should you repot palmate begonia?

Every 2–3 years, into bone-dry mix for palmate begonia. Repot palmate begonia every 2–3 years into a snug pot of gritty, free-draining loam-based or peat-free compost, ideally in spring or summer. Let it sit in dry soil and do not water for about a week afterwards so any nicked roots can callus. Over-potting and watering straight away is what rots succulents.

What size pot does palmate begonia need?

When is the best time of year to repot palmate begonia?

Should you water palmate begonia after repotting?

No — not straight away. Repot palmate begonia into dry mix and wait about a week before the first watering so any damaged roots callus over. Watering a freshly repotted succulent is the single most common way to rot one.

Should you fertilise palmate begonia after repotting?

Not immediately. Wait about 3 weeks after repotting palmate begonia. Fresh mix already contains nutrients, and feeding freshly cut or disturbed roots burns them. Resume your normal feeding routine once you see new growth.