Bougainvillea (Paper flower) care

Light

Most houseplants will scorch where bougainvillea thrives. Give it the windowsill you'd otherwise leave empty because everything else burned there. Needs full direct sun, at least 6 hours daily, to bloom; shade or low light produces leggy growth and few bracts. Indoors, place within 30 cm of a bright south-facing window. A plant moved abruptly from low light to direct sun bleaches in 48 hours — always acclimatise over a week.

Watering

Aim for when the top few centimetres of soil dry out for bougainvillea, but treat that as a starting point rather than a rule. A south-facing summer windowsill will dry the pot twice as fast as a north-facing winter room. Lift the pot; if it feels noticeably lighter than it did wet, water it. Drought-tolerant and a 'bloom-on-stress' plant: let the root zone go slightly dry between deep waterings. Overwatering causes lush leaves with few flowers, root rot, and yellowing. Reduce watering sharply in winter dormancy.

Soil and pot

Bougainvillea grows best in fast-draining, slightly acidic loam or sandy mix. Tolerates most soils provided drainage is excellent and it never stays waterlogged. Prefers a pH around 6.0-6.5. For containers, RHS suggests a peat-free, loam-based compost such as John Innes No. 3. 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

Bougainvillea sits happiest at around Average; 40-60% humidity and 16-30 C ideal; keep above 10 C (60-85 F ideal; keep above 50 F). Adaptable to ordinary household and garden humidity. RHS notes higher humidity in bright spring periods can encourage bud break, but soggy, stagnant air invites fungal leaf spot, so prioritise airflow over misting. If you keep the room above 16 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 bougainvillea sparingly. Feed monthly during active growth from spring to late summer. To maximise bracts, favour a low-nitrogen, higher-potassium/phosphorus formula once growth is established; excess nitrogen drives foliage at the expense of flowers. Stop feeding in autumn and winter. 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 bougainvillea in the Growli community. Each is annotated with the most common cause so you know where to start.

• Few or no flowers — Usually too little sun, overwatering, or high-nitrogen feed driving leaves over bracts. Give full sun, let it dry between waterings, and switch to a low-nitrogen feed.
• Yellowing leaves and leaf drop — Often overwatering or root rot, but also natural seasonal drop or cold/drought stress. Check drainage and let soil dry; seasonal drop in cool weather is normal.
• Sap-sucking pests — Aphids, spider mites, mealybugs, and whiteflies cause speckling, webbing, sticky residue, and distorted growth. Improve airflow and treat with insecticidal soap or neem oil.
• Thorn injuries — Stiff, sharp thorns can scratch people and pets and snag skin. Wear thick gloves when pruning and site plants away from paths and pet areas.
• Cold damage — Foliage is harmed below about 4 C (40 F) and the plant is not frost-hardy. Move containers indoors or protect before first frost; keep above 10 C overwinter.
• Magnesium deficiency / chlorosis — Yellowing between veins on older leaves, common in poor or alkaline soils. Maintain slightly acidic soil; an Epsom-salt or balanced micronutrient feed can correct it.

Propagation

Propagate from stem cuttings of the current season's growth taken in summer; semi-ripe cuttings root in about 4-6 weeks with bottom heat, while hardwood cuttings take longer. Layering is often the most reliable method. Cuttings can be tricky, so take several. 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

Bougainvillea is mildly toxic to pets. Bougainvillea is NOT individually listed in the ASPCA toxic or non-toxic plant database, and no Bougainvillea species or related Nyctaginaceae plant appears on it, so a clean pet-safe status cannot be confirmed. The genuine hazard is mechanical: large, sharp thorns can injure mouths and paws, and the sap is a mild skin/GI irritant. Treat as mildly-toxic and verify with your vet. 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.

Bougainvillea deep-dive guides

Every aspect of bougainvillea care, each with its own calibrated guide:

• Bougainvillea watering schedule
• Bougainvillea light requirements
• Best soil mix for bougainvillea
• Bougainvillea fertilizing guide
• When to repot bougainvillea
• How to propagate bougainvillea
• Bougainvillea growth rate & size
• Bougainvillea cold hardiness
• Bougainvillea temperature & humidity
• Is bougainvillea toxic to cats & dogs?
• Getting bougainvillea to bloom

Related guides

Bougainvillea is also known as Bougainvillea, Paper flower, and Lesser bougainvillea.

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• All 609 plant care guides in the Growli library