Poinsettia

Growing in Pots, Balconies & Indoors

Poinsettia (Euphorbia pulcherrima) is the classic indoor pot plant, and the grower confirms it as a houseplant. Interestingly he does not recommend it for long-term planter or container growing outdoors – treat it as a seasonal indoor plant rather than a permanent patio subject.

Quick Details

• Container Size: A snug indoor pot, about 2-5 L, matched to the plant
• Indoor Suitability: A good houseplant – grown indoors for its coloured bracts
• Best Spot: Bright, indirect light indoors; the grower notes it tolerates part to full shade
• Soil & Drainage: Free-draining, peat- or coir-based potting mix
• Watering in Pots: Keep lightly, evenly moist; let the surface dry and never leave it standing in water

Indoors & On the Windowsill

• A true houseplant: The grower rates it as suitable indoors. Give it bright, indirect light and steady warmth away from cold draughts and heat sources for the longest-lasting colour.
• Light: It flowers well in modest light and the grower notes it accepts part to full shade indoors – unusual for a Euphorbia – but bright, indirect light keeps it strongest.
• Long-term containers: The grower does not recommend it for permanent planter or container culture, so enjoy it as a seasonal indoor pot plant rather than expecting years from one container.
• Safety: The milky sap is a mild irritant and can upset pets or children if chewed – keep it out of reach and avoid getting sap on skin or eyes.

On a Balcony or Patio

• Seasonal only: It can spend warm, frost-free spells outdoors in a sheltered, bright spot, but the grower does not rate it for long-term outdoor containers – and any chill or wind will quickly spoil it. Bring it back inside before temperatures drop.

Choosing the Pot, Soil & Long-Term Care

• Pot & drainage: A snug 2-5 L pot matched to the plant with strong drainage holes; skip a standing water saucer so the roots never sit wet. Terracotta breathes and dries fast, while glazed or plastic pots hold moisture longer.
• Potting mix: A free-draining, peat- or coir-based potting mix.
• Watering: Keep lightly and evenly moist while in leaf; let the surface dry between waterings and never leave the pot standing in water.
• Feeding: Potted plants exhaust their soil faster because nutrients leach out with every watering – feed lightly but regularly through the growing season.
• Repotting: Refresh the mix or pot up about every couple of years, teasing out and lightly trimming the roots of established plants.

Bloom & Flower Guide

Quick Details

• Bloom Season: Autumn and winter
• Flower Appearance: Small yellow true flowers (cyathia) at the shoot tips, surrounded by large showy bracts in red, pink, yellow, orange, pale green, or white
• Edibility: Not edible – the milky sap can irritate skin and eyes; grown purely as an ornamental

Detailed Blooming Overview

The poinsettia”s celebrated winter display is not really a flower show at all: the tiny true flowers are the yellow cyathia bunched at the centre, while the colour that makes the plant so popular comes from large modified leaves (bracts) that turn red, pink, cream and other shades as the nights lengthen through autumn and winter.

Flower Characteristics

• Small yellow true flowers (cyathia) clustered at the shoot tips.
• Surrounded by large, showy bracts.
• Bracts in red, pink, yellow, orange, pale green, or white.

Bloom Care & Thinning

• Colouring up: To colour for the season, the plant needs long, uninterrupted nights (about 14 hours of darkness) for several weeks in autumn.
• Handling: Wear gloves when pruning, as the sap is an irritant.
• Position: Bright, indirect light once the bracts have coloured.