How to Grow Poinsettia
Euphorbia pulcherrima
Poinsettias need bright indirect light, temperatures above 15°C, and protection from cold draughts and temperature swings. Water when the top 2 cm of soil feels dry and never let the pot sit in water. To trigger re-flowering, give the plant 14 hours of complete darkness each day for 8 weeks from late September. Prune back hard in spring to keep the plant bushy.
Yearly Lifecycle
Care Essentials
Feed monthly with a balanced liquid houseplant fertiliser from spring through autumn to support leaf and bract development. Stop feeding in winter when the plant is resting.
Watch For
- Whitefly — very common on poinsettia
- Fungus gnats in wet compost
- Root rot from overwatering or poor drainage
- Botrytis grey mould in cold, damp conditions
- Leaf drop from cold draughts or temperature fluctuations
Track your Poinsettia care schedule — pruning, feeding, and seasonal tasks
Start planning freeCare Requirements
☀️ Light
Bright indirect light, no direct sun
Place near a south- or east-facing window but out of direct midday sun, which scorches the bracts. Low light causes poor colour and leggy growth.
💧 Watering
Water when top 2 cm of compost is dry
Water thoroughly until it drains from the base, then discard any water in the saucer after 30 minutes. Never allow the pot to sit in water — root rot develops quickly.
🌱 Fertilizing
Monthly balanced liquid feed, spring to autumn
Use a balanced houseplant fertiliser (e.g. 10-10-10 NPK) once a month from spring through to autumn. Do not feed in winter while the plant is resting.
✂️ Pruning
Hard prune to 10–15 cm in spring
Once new growth begins in spring, cut all stems back to 10–15 cm. This stimulates multiple new shoots and produces a bushy plant with better bract coverage the following winter.
🌿 Temperature
Keep above 15°C, away from draughts and cold glass
Poinsettias are tropical plants that cannot tolerate cold. Keep them at 15–22°C and away from cold windows, outside doors, and draughts. Temperatures below 10°C cause immediate, irreversible leaf drop.
Growing Tips
Darkness protocol for re-flowering
From late September, place the plant in complete darkness for 14 hours each day for 8 consecutive weeks. Even brief light exposure during this period will reset the cycle — use a cardboard box or dark cupboard.
Spring hard prune for bushiness
Cut all stems back to 10–15 cm in spring once new growth begins. This is the single most important step for producing a well-branched plant with abundant bracts the following winter.
Avoid cold windowsills
Poinsettias are tropical plants. Cold glass, draughts from opening doors, and temperatures below 15°C cause rapid leaf drop. Keep them on a warm shelf well away from any cold surface.
Let the soil dry slightly between waterings
Overwatering is the most common cause of decline. Water thoroughly, then wait until the top 2 cm of compost feels dry before watering again. Always discard water from the saucer after 30 minutes.
Pests & Diseases
Pest Whitefly
Identification: Tiny white winged insects that fly up in clouds when the plant is disturbed. Sticky honeydew on leaves and sooty mould are secondary signs.
- Yellow sticky traps to monitor and reduce adult populations.
- Spray with insecticidal soap or neem oil, covering leaf undersides thoroughly. Repeat every 5–7 days.
- Systemic insecticide containing imidacloprid applied as a soil drench for persistent infestations.
Pest Fungus Gnats
Identification: Small dark flies hovering around the compost surface. Larvae live in the top layer of wet compost and feed on roots.
- Allow the surface of the compost to dry out between waterings — larvae cannot survive in dry conditions.
- Apply a layer of fine sand or horticultural grit on top of the compost to deter egg-laying.
- Yellow sticky traps at soil level to catch adults.
- Drench the compost with a product containing Bacillus thuringiensis israelensis (Bti) as a biological larvicide.
Pest Mealybug
Identification: White fluffy waxy clusters in leaf axils and along stems. Plants become weakened and leaves may yellow and drop.
- Dab individual colonies with a cotton bud dipped in rubbing alcohol.
- Spray with insecticidal soap, ensuring coverage in all hidden crevices.
- Systemic insecticide containing acetamiprid for heavy infestations.
Disease Root Rot Phytophthora cinnamomi
Symptoms: Wilting despite moist compost, yellowing lower leaves, brown mushy roots. The plant may collapse suddenly even though watering appears correct.
Treatment: Remove the plant from its pot and cut away all brown, mushy roots with sterile scissors. Dust cut surfaces with powdered charcoal or sulphur and repot into fresh, well-draining compost. Reduce watering frequency.
Prevention: Use a well-draining compost with added perlite. Never allow the pot to sit in standing water. Water only when the top 2 cm of compost is dry.
Disease Botrytis Grey Mould Botrytis cinerea
Symptoms: Fluffy grey mould on leaves, bracts, or stems — typically starting at the base of the plant or on damaged tissue. Affected tissue turns brown and collapses.
Treatment: Remove all affected parts immediately using sterile scissors. Improve air circulation around the plant and reduce humidity. Avoid wetting the foliage when watering.
Prevention: Maintain good air circulation, avoid overcrowding houseplants, and keep foliage dry. Do not leave dead leaves in the pot.
Log Poinsettia in your garden — track growth, care, and harvests year after year
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