Repotting guide

When & how to repot Bedding Begonia (Begonia semperflorens)

Also called Wax begonia, Bedding begonia.

More about bedding begonia

About Bedding Begonia

Begonia semperflorens · also called Wax begonia, Bedding begonia · flowering

Wax begonia is a compact, mounding tender perennial grown as an annual, with glossy green or bronze waxy leaves and continuous clusters of white, pink or red flowers. Tolerant of both sun and shade, it needs no deadheading and shrugs off heat, making it one of the most reliable bedding and container plants.

Mature size: 15-30 cm tall and 15-30 cm wide.

Watch for — Stem and root rot: Overwatering or poor drainage collapses the succulent stems; let soil dry slightly and ensure pots drain freely.

How to tell bedding begonia needs repotting

Repotting on a calendar is less reliable than reading the plant. For bedding 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 bedding begonia

Every 2–3 years, into bone-dry mix. Bedding Begonia's growth habit — compact, well-branched mounding habit with brittle, succulent stems and rounded waxy leaves; flowers self-clean, so no deadheading is needed. — sets the pace. Wax begonia is a compact, mounding tender perennial grown as an annual, with glossy green or bronze waxy leaves and continuous clusters of white, pink or red flowers. Tolerant of both sun and shade, it needs no deadheading and shrugs off heat, making it one of the most reliable bedding and container plants.

What size pot to step bedding begonia up to

Use a pot only one size up — or even the same pot with fresh gritty mix if the roots have room. Bedding 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 bedding begonia

Spring or summer, while bedding 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 bedding begonia

Repot dry. Do not water bedding 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 rich, well-drained, humusy mix 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 bedding 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 bedding 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 bedding begonia

Bedding Begonia wants rich, well-drained, humusy mix. Light, fertile, free-draining soil or peat-free potting mix high in organic matter, pH 5.5-6.5. Sharp drainage is essential to prevent stem and root rot. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting bedding begonia — frequently asked questions

How often should you repot bedding begonia?

Every 2–3 years, into bone-dry mix for bedding begonia. Repot bedding begonia every 2–3 years into a snug pot of rich, well-drained, humusy mix, 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 bedding begonia need?

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

Should you water bedding begonia after repotting?

No — not straight away. Repot bedding 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 bedding begonia after repotting?

Not immediately. Wait about 3 weeks after repotting bedding 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.