Bougainvillea glabra

Growing in Pots, Balconies & Indoors

Bougainvillea glabra (1-5 m / 3-16 ft) is a superb container and balcony plant but not a houseplant – it needs strong, direct sun to flower and simply will not bloom in ordinary indoor light. In a pot on a hot, sunny patio or balcony it flowers freely, and it takes well to pruning, training, and even bonsai.

Quick Details

• Container Size: A medium tub with excellent drainage; bougainvillea flowers best slightly root-bound, so do not over-pot it
• Indoor Suitability: Not a houseplant – too little light indoors to bloom; only worth bringing inside to overwinter in cold climates
• Best Spot: Full sun and warmth – the sunniest wall, patio, or balcony
• Soil & Drainage: Free-draining, aerated mix; never waterlogged
• Watering in Pots: Water when the top of the mix dries; slight dryness actually encourages flowering, but pots dry fast in heat

Indoors & On the Windowsill

• Houseplant limits: It will not thrive as a room plant – without strong direct sun it drops its leaves and refuses to flower.
• Overwintering indoors: Bougainvillea is frost-tender. In cold climates move the pot into a bright, cool, frost-free room for winter, water sparingly while it rests, then return it outside once frost has passed.

On a Balcony or Patio

• Light, wind & heat: Give it the hottest, sunniest spot. Walls and railings reflect heat and pots dry quickly, so check moisture often in summer.
• Thorns & support: The stems are thorny and vigorous – tie in or trellis climbing types, shelter them from strong wind, and take care when handling as the thorns and sap can irritate skin.

Choosing the Pot, Soil & Long-Term Care

• Pot & drainage: Strong drainage holes and no standing saucer, to avoid root rot. Terracotta breathes and dries fast; glazed or plastic holds moisture longer.
• Potting mix: Aerated, organic-rich – peat or coir with perlite or vermiculite.
• Feeding: Potted bougainvillea needs feeding through the growing season as nutrients leach; a lower-nitrogen bloom feed supports flowers rather than just leafy growth.
• Repotting: Refresh the mix and pot on about every two years, which is the grower’s own guidance. Keep it only modestly larger so it stays free-flowering, and give it a light root and top prune to hold its shape.

Bloom & Flower Guide

Quick Details

• Bloom Season: Late spring to midsummer, sometimes into late summer
• Time to First Bloom: Often flowers while still young, within its first season or two
• Flower Appearance: Small white-yellowish true flowers set within three papery bracts in white, purple, pink, red and purplish shades
• Edibility: Ornamental — grown for its colourful bracts; the flowers are not eaten

Detailed Blooming Overview

Bougainvillea glabra (paperflower) earns its name from the papery texture of its bracts. The small white-yellow true flowers are easy to miss; it is the three surrounding bracts — white, purple, pink, red and purplish, with a wide range of hues between — that light up the plant from late spring through midsummer and sometimes into late summer.

Flower Characteristics

• Small, white-yellowish true flowers.
• Surrounded by three papery bracts in white, purple, pink, red and purplish, with many intermediate hues.

Bloom Care & Thinning

• Encouraging bloom: Full sun, lean feeding and slight drying between waterings favour more bracts over leafy growth.
• Pollinators: The bright bracts help draw in butterflies and, in some regions, hummingbirds.
• Handling: Wear gloves when pruning or training — the stems are thorny.