Repotting guide

When & how to repot African Crossandra (Crossandra nilotica)

Also called African Crossandra, Red Firecracker Flower, Red Crossandra.

More about african crossandra

About African Crossandra

Crossandra nilotica · also called African Crossandra, Red Firecracker Flower · flowering

A compact African shrub distinct from the Indian firecracker flower, bearing narrow leaves and coral-to-brick-red flower spikes. It tolerates drier air better than its relatives but demands bright light and consistent warmth to bloom. Water evenly, avoid cold draughts, and feed lightly through the growing season for reliable flowering.

Mature size: 30–60 cm tall (12–24 in), spread of 30–45 cm (12–18 in)

Watch for — Failure to bloom: Almost always caused by insufficient light. Move the plant to a brighter spot with some direct morning sun. Low temperatures below 18°C also suppress flowering.

How to tell african crossandra needs repotting

Repotting on a calendar is less reliable than reading the plant. For african crossandra, 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 african crossandra) 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 african crossandra

Only every 2–4 years, when genuinely crowded. African Crossandra 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, bushy, evergreen perennial sub-shrub.

What size pot to step african crossandra up to

Go up only one pot size — roughly 2–3 cm (about an inch) wider in diameter, no more. African Crossandra 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 african crossandra 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 african crossandra

Early spring, just as new growth restarts, is the ideal window for african crossandra. 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 african crossandra

Confirm it actually needs it. Slide african crossandra 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 african crossandra 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 well-draining loam-based 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 african crossandra 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 african crossandra

African Crossandra wants well-draining loam-based mix with added perlite. Use a fertile, well-draining mix such as peat-free loam combined with 25% perlite or grit. Good drainage is essential to prevent root rot. A slightly acidic pH of 6.0–6.5 suits the genus. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting african crossandra — frequently asked questions

How often should you repot african crossandra?

Only every 2–4 years, when genuinely crowded for african crossandra. Only repot african crossandra 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 well-draining loam-based mix with added perlite. The key mistake is over-potting: a too-big pot stays wet and rots the roots.

What size pot does african crossandra need?

When is the best time of year to repot african crossandra?

Does african crossandra like to be root-bound?

Yes — african crossandra 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 african crossandra after repotting?

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