Crossandra (firecracker flower) (firecracker flower) care

Light

Bright but filtered. Crossandra (firecracker flower) burns within days in unfiltered south-facing summer sun, and stops growing within months in deep shade. Bright, indirect light keeps it flowering; an east window or a spot a little back from a south or west window is ideal. A few hours of gentle morning sun is fine, but shield it from hot midday glare, which scorches leaves. Too little light stops blooming and produces leggy growth. If you only have a south window, set the plant back 1.5 m or hang a sheer curtain — both knock the intensity down into the right range.

Watering

Watering crossandra (firecracker flower): when the top 2-3 cm of soil starts to dry, often every 4-7 days in growth. The number that matters isn't the day of the week — it's how dry the top 2-3 cm of the pot feels. A finger in the soil tells you more than a watering app. After every watering, tip the saucer. Keep the soil lightly and evenly moist during spring and summer, watering with tepid (not cold) water. Crossandra is drought-sensitive and sulks if it dries out fully, but never let it sit soggy. Ease off in winter, letting the surface dry a little more between waterings.

Soil and pot

Crossandra (firecracker flower) grows best in 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. A pot with a working drainage hole is non-negotiable for this species — even free-draining mix will turn soggy in a closed planter. If you love the look of a decorative pot without a hole, use it as a cachepot around an inner nursery pot you can lift out to water.

Humidity and temperature

Crossandra (firecracker flower) sits happiest at around 50-60%+ humidity and 18-27°C (65-80°F). A high-humidity lover. Group it with other plants, stand the pot on a pebble-and-water tray (base above the waterline), or run a humidifier. Dry indoor air encourages spider mites and crisp leaf edges. If you keep the room above 18 year-round and avoid placing the plant near a cold draught, a hot radiator, or an air-conditioning vent, you have already handled the two biggest indoor stressors.

Fertilising

Feed crossandra (firecracker flower) sparingly. Feed every 2 weeks through spring and summer with a balanced water-soluble houseplant fertiliser at half strength; a feed with a little extra potassium supports flowering. Stop or reduce feeding in autumn and winter while growth slows. Skip fertiliser entirely on a stressed, recently-repotted, or actively wilting plant — fertiliser salts make damage worse, not better. Wait for a round of healthy new growth before resuming a feeding rhythm.

Common problems

Below are the issues we see most often on crossandra (firecracker flower) in the Growli community. Each is annotated with the most common cause so you know where to start.

• Sudden leaf or flower drop — Usually from letting the soil dry out completely, cold draughts, or temperatures dipping below about 13-15°C.
• Yellowing lower leaves — Typically overwatering or soggy soil, which suffocates roots and can lead to root rot.
• Few or no flowers — Most often caused by too little light, though missing a slightly cooler, drier winter rest can also reduce spring blooming.
• Spider mites — Dry indoor air invites these sap-suckers, seen as fine webbing and pinpoint yellow speckling under leaves.
• Mealybugs, aphids and whitefly — Sap-feeding insects that cluster on new growth and leaf undersides, leaving sticky honeydew and sometimes sooty mould.
• Crispy brown leaf edges — A sign of low humidity or under-watering in warm, dry rooms.

Companion plants

Crossandra (firecracker flower) pairs well with Polka dot plant, Calathea, Fittonia, and Peace lily. These are species with similar light and water needs, so you can group them in the same room or on the same shelf and water as a batch.

Propagation

Propagate from stem-tip cuttings taken in spring or early summer. Take 8-10 cm cuttings, remove the lower leaves, optionally dip in rooting hormone, and root in a moist, free-draining mix kept warm (a heat mat helps) and humid. Crossandra can also be grown from seed. Propagation is the cheapest, most satisfying way to expand a collection — and it doubles as insurance against losing a mature plant to an accident. Take a backup cutting once the parent is established and healthy.

Toxicity to pets

Crossandra (firecracker flower) is pet-safe. The ASPCA lists Crossandra (family Acanthaceae) as non-toxic to cats, dogs and horses, so it is considered pet-safe. It contains no known insoluble calcium oxalates or toxic alkaloids associated with houseplant poisoning. As with any plant, a curious pet that eats a large amount may still get mild stomach upset, so discourage nibbling and contact your vet if symptoms appear. If you keep cats, dogs, or curious children in the house, weigh placement carefully — a high shelf or a hanging planter is enough for casual safety. For severe ingestion incidents, call your local vet and the ASPCA Animal Poison Control Center (in the US, 888-426-4435).

Pet-safety status is sourced from the ASPCA Toxic and Non-Toxic Plant List, which catalogues the most-asked-about plants for cats, dogs, and horses.

Crossandra (firecracker flower) deep-dive guides

Every aspect of crossandra (firecracker flower) care, each with its own calibrated guide:

• Crossandra (firecracker flower) watering schedule
• Crossandra (firecracker flower) light requirements
• Best soil mix for crossandra (firecracker flower)
• Crossandra (firecracker flower) fertilizing guide
• When to repot crossandra (firecracker flower)
• How to propagate crossandra (firecracker flower)
• Crossandra (firecracker flower) growth rate & size
• Crossandra (firecracker flower) cold hardiness
• Crossandra (firecracker flower) temperature & humidity
• Is crossandra (firecracker flower) toxic to cats & dogs?
• Getting crossandra (firecracker flower) to bloom

Related guides

Crossandra (firecracker flower) is also commonly called firecracker flower or firecracker plant.

• Peace lily care — light, water and common problems
• Bird of paradise care — light, water and common problems
• Hoya care — light, water and common problems
• All 271 plant care guides in the Growli library