Repotting guide

When & how to repot Free-flowering Streptocarpus (Streptocarpus floribundus)

Also called Free-flowering Streptocarpus, Kranskop Streptocarpus.

More about free-flowering streptocarpus

About Free-flowering Streptocarpus

Streptocarpus floribundus · also called Free-flowering Streptocarpus, Kranskop Streptocarpus · houseplant

Streptocarpus floribundus is a rare, threatened perennial herb native to the doleritic cliff faces of Kranskop in KwaZulu-Natal, South Africa, where it grows in cool, shaded, moist crevices. It produces masses of mauve-purple, tubular flowers — hence the species epithet floribundus, meaning 'flowering freely' — mainly in early summer. The most critical care requirement is avoiding overwatering, as this plant is extremely sensitive to waterlogged roots despite needing consistently moist conditions. Cape primrose (Streptocarpus) is listed by the ASPCA as non-toxic to cats and dogs.

Mature size: Leaves 25–50 cm long; flowering scapes to 25 cm tall; clump spread 30–45 cm.

Watch for — Crown and root rot: The most frequent killer; caused by wet, compacted compost or water sitting in the crown. Repot into fresh open mix, remove all soft or blackened tissue, and dust cut surfaces with cinnamon or powdered sulphur before repotting.

How to tell free-flowering streptocarpus needs repotting

Repotting on a calendar is less reliable than reading the plant. For free-flowering streptocarpus, 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 free-flowering streptocarpus) 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 free-flowering streptocarpus

Only every 2–4 years, when genuinely crowded. Free-flowering Streptocarpus 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. Compact, stemless perennial herb with a basal rosette of soft, hairy, strap-like leaves; produces successive flushes of flowers on branching scapes from the leaf axils..

What size pot to step free-flowering streptocarpus up to

Go up only one pot size — roughly 2–3 cm (about an inch) wider in diameter, no more. Free-flowering Streptocarpus 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 free-flowering streptocarpus 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 free-flowering streptocarpus

Early spring, just as new growth restarts, is the ideal window for free-flowering streptocarpus. 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 free-flowering streptocarpus

Confirm it actually needs it. Slide free-flowering streptocarpus 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 free-flowering streptocarpus 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 peat-free, open, moisture-retentive mix with added perlite, 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 free-flowering streptocarpus 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 free-flowering streptocarpus

Free-flowering Streptocarpus wants peat-free, open, moisture-retentive mix with added perlite. A 50:50 blend of peat-free multi-purpose compost and perlite drains freely while holding just enough moisture; avoid dense, heavy composts that stay wet around the crown and cause 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 free-flowering streptocarpus — frequently asked questions

How often should you repot free-flowering streptocarpus?

Only every 2–4 years, when genuinely crowded for free-flowering streptocarpus. Only repot free-flowering streptocarpus 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 peat-free, open, moisture-retentive mix with added perlite. The key mistake is over-potting: a too-big pot stays wet and rots the roots.

What size pot does free-flowering streptocarpus need?

When is the best time of year to repot free-flowering streptocarpus?

Does free-flowering streptocarpus like to be root-bound?

Yes — free-flowering streptocarpus 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 free-flowering streptocarpus after repotting?

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