Repotting guide

When & how to repot Crossandra (firecracker flower) (Crossandra infundibuliformis)

Also called firecracker flower, firecracker plant.

More about crossandra (firecracker flower)

About Crossandra (firecracker flower)

Crossandra infundibuliformis · also called firecracker flower, firecracker plant · flowering

Crossandra is a tender tropical from the acanthus family, grown indoors for its fan-shaped orange, salmon or coral flowers that appear almost year-round. It wants bright indirect light, warmth and steadily moist soil. The ASPCA lists Crossandra as non-toxic to cats, dogs and horses, so it is pet-safe.

Mature size: Typically 30-90 cm (1-3 ft) tall and 30-60 cm (1-2 ft) wide as a houseplant

Watch for — Yellowing lower leaves: Typically overwatering or soggy soil, which suffocates roots and can lead to root rot.

How to tell crossandra (firecracker flower) needs repotting

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

Only every 2–4 years, when genuinely crowded. Crossandra (firecracker flower) 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, bushy evergreen sub-shrub with glossy dark-green leaves and upright flower spikes.

What size pot to step crossandra (firecracker flower) up to

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

Early spring, just as new growth restarts, is the ideal window for crossandra (firecracker flower). 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 crossandra (firecracker flower)

Confirm it actually needs it. Slide crossandra (firecracker flower) 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 crossandra (firecracker flower) 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, free-draining, slightly acidic potting 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 crossandra (firecracker flower) 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 crossandra (firecracker flower)

Crossandra (firecracker flower) wants rich, free-draining, slightly acidic potting mix. Use a peat-free houseplant compost high in organic matter with added perlite for drainage. It prefers an acidic pH (below about 6.0). A pot with drainage holes is essential to avoid 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 crossandra (firecracker flower) — frequently asked questions

How often should you repot crossandra (firecracker flower)?

Only every 2–4 years, when genuinely crowded for crossandra (firecracker flower). Only repot crossandra (firecracker flower) 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, free-draining, slightly acidic potting mix. The key mistake is over-potting: a too-big pot stays wet and rots the roots.

What size pot does crossandra (firecracker flower) need?

When is the best time of year to repot crossandra (firecracker flower)?

Does crossandra (firecracker flower) like to be root-bound?

Yes — crossandra (firecracker flower) 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 crossandra (firecracker flower) after repotting?

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