Repotting guide

When & how to repot Gloxinia perennis (Gloxinia perennis)

Also called Canterbury bells gloxinia, perennial gloxinia.

More about gloxinia perennis

About Gloxinia perennis

Gloxinia perennis · also called Canterbury bells gloxinia, perennial gloxinia · flowering

Gloxinia perennis is the true gloxinia, an upright rhizomatous gesneriad bearing nodding, bell-shaped lavender-blue flowers with a mint-scented presence over glossy, scalloped leaves. Native to Central and South America, it grows from a scaly rhizome, goes semi-dormant, and rewards warm, humid, brightly lit culture with tall flowering stems in summer and autumn.

Mature size: Stems reach 30-90 cm tall in good conditions; spreads slowly as the rhizome offsets.

Watch for — Rhizome rot: Wet, airless soil rots the scaly rhizome. Use a free-draining mix, water less in dormancy, and never let the pot sit in standing water.

How to tell gloxinia perennis needs repotting

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

Roots spiralling thickly out of the drainage holes or pushing the whole plant up out of the pot.
The pot is so packed that water runs straight through in seconds and barely wets the soil.
It has split a plastic pot, or the rootball is a solid mass with almost no soil left when you slide it out.
Growth and (for gloxinia perennis) flowering have clearly stalled despite good light and feeding — but remember this plant likes being snug, so a little crowding alone is not a reason to repot.

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 gloxinia perennis

Only every 2–4 years, when genuinely crowded. Gloxinia perennis is one of the plants that genuinely prefers a snug pot — it grows and flowers better with its roots a little restricted, so resist the urge to repot it on schedule. Upright herbaceous perennial growing from a scaly underground rhizome. Sends up leafy stems to a metre that carry nodding bell flowers, then dies back to the rhizome for a semi-dormant rest period..

What size pot to step gloxinia perennis up to

Go up only one pot size — roughly 2–3 cm (about an inch) wider in diameter, no more. Gloxinia perennis positively prefers a snug pot: it flowers and grows better when the roots are a little restricted. The single biggest repotting mistake here is over-potting — dropping gloxinia perennis into a pot two or three sizes up. All that surplus soil holds water the small root system cannot use, stays cold and wet, and rots the roots within weeks. When in doubt, choose the smaller pot.

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 gloxinia perennis

Early spring, just as new growth restarts, is the ideal window for gloxinia perennis. The plant is moving into its strongest growth phase and re-roots into fresh soil quickly. Avoid repotting in winter dormancy or, for flowering plants, while it is in bud or bloom — recovery is slowest then and you risk dropping the flowers.

Step-by-step: repotting gloxinia perennis

Confirm it actually needs it. Slide gloxinia perennis out and check the roots. Only continue if it is genuinely packed — this plant prefers a snug pot, so if there is still soil and room, put it straight back.
Pick a pot only one size up. Choose a pot just 2–3 cm wider with good drainage. Resist anything bigger; over-potting is the main killer here.
Ease it out gently. Water lightly the day before, then tip gloxinia perennis out, supporting the base. Tease the outer roots free only enough to stop them circling.
Repot at the same depth. Add a layer of fresh rich, well-drained gesneriad or african-violet mix, set the plant so the soil line sits exactly where it did before, and backfill around the sides, firming lightly.
Settle it in. Water once to settle the soil, then let it sit. Hold off on more water until the top of the soil dries — fresh soil around a small root system stays wet for a while.

Aftercare

Because the new soil holds more water than the old crammed rootball did, ease right back on watering — let the top of the soil dry before you water gloxinia perennis again, or you will rot the roots in the very pot you just moved it to. Keep it out of harsh direct sun for a fortnight. Do not fertilise for about 4 weeks — fresh mix already carries nutrients and feeding freshly disturbed roots scorches them.

The right soil mix for gloxinia perennis

Gloxinia perennis wants rich, well-drained gesneriad or african-violet mix. A loose, humus-rich blend of peat or coir with perlite and a little composted bark holds moisture yet drains freely. The scaly rhizome rots in dense, sodden soil, so aeration around the roots is essential. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting gloxinia perennis — frequently asked questions

How often should you repot gloxinia perennis?

Only every 2–4 years, when genuinely crowded for gloxinia perennis. Only repot gloxinia perennis every 2–4 years, and only when it is genuinely root-bound — it flowers and grows best slightly crowded. Step up just one pot size in spring using rich, well-drained gesneriad or african-violet mix. The key mistake is over-potting: a too-big pot stays wet and rots the roots.

What size pot does gloxinia perennis need?

When is the best time of year to repot gloxinia perennis?

Does gloxinia perennis like to be root-bound?

Yes — gloxinia perennis genuinely flowers and grows best when slightly pot-bound, so do not rush to repot it. The mistake to avoid is over-potting into a much larger pot: the excess soil stays wet, the roots cannot use it, and the plant rots. Only repot every few years and only one snug size up.

Should you fertilise gloxinia perennis after repotting?

Not immediately. Wait about 4 weeks after repotting gloxinia perennis. Fresh mix already contains nutrients, and feeding freshly cut or disturbed roots burns them. Resume your normal feeding routine once you see new growth.