Poinsettia care in spring: how to keep it alive through summer

The crucial weeks of spring determine whether it will even make it through the summer.

Many people buy a poinsettia for its red bracts during Advent, then sadly discard what appears to be a struggling houseplant in February. Yet this plant has far greater potential. Follow two or three straightforward rules in March and April, and that festive decoration can become a hardy green plant that brightens a balcony or living room well into summer.

At-a-glance poinsettia profile

Botanical name	Euphorbia pulcherrima
Common name	Poinsettia
Size in a pot	30–60 cm tall, 30–50 cm wide
Position	Plenty of light without direct sun; partial shade outdoors in summer
Temperature	No frost; consistently above 13 °C
Foliage	Evergreen indoors, though stress can cause leaf drop

The most common reason for failure in spring: too much water combined with warm, dry air. In March, restraint is vital – along with a cool, bright spot.

March: respect the resting phase

At the end of winter, the poinsettia is still dormant. Its red bracts have faded, some leaves may be yellowing and growth has stopped. This is precisely when the biggest mistake is often made: watering it as frequently as in December while keeping it in a warm place above a radiator. That combination quickly leads to root rot and falling leaves.

Water less and move it somewhere cooler

• Position: Choose a bright location out of direct sunlight, at 13–16 °C, away from radiators and draughts.
• Water: Water only once the compost has almost dried out completely – usually every few weeks; never leave water standing in the saucer.
• Care: Avoid heavy pruning; simply remove brown foliage carefully.
• Protection: Wear gloves while tidying the plant, as its white sap can irritate the skin.

Patience now pays off. During this period, the plant builds reserves for its new start. The aim is to keep the roots dry, avoid overloading the leaves and maintain a low temperature.

April: repot and restart with a gentle boost

When fresh, small leaves emerge on the shoots, the growing season has begun. This is the time for a spring check and repotting into a container only slightly larger than the current one. Drainage holes are essential, as is a layer of expanded clay or perlite to keep the compost open and free-draining.

When repotting, loosen the root ball gently, shake away old compacted compost and fill around it with good-quality houseplant compost. Then water sparingly – just enough for the compost to settle evenly around the roots.

Light, water and temperature: achieving the right balance

• Light: Keep it in a very bright place, protected from direct midday sunshine; an east- or west-facing window is ideal.
• Temperature: 18–20 °C encourages new growth without causing stress.
• Watering test: Push a finger into the compost – if the upper layer feels dry, water it. If not, wait.
• Water quality: Lukewarm, low-limescale water helps prevent leaf marks and salt stress.

If desired, lightly pinch out the shoot tips after new growth appears. This encourages branching and produces a fuller, bushier plant. Avoid drastic cuts, as they remove more plant material than necessary.

From late April into summer: lush green growth in a pot

As temperatures rise, so does the plant’s need for water – but without allowing it to become waterlogged. A clear routine is helpful: water once the surface has dried, then remove any excess water immediately. Add a liquid fertiliser for flowering plants to the watering can every two to three weeks. This supports the leaves and shoots, helping the plant remain compact and rich green.

Once there is no longer any risk of frost, the pot can go outside. A partially shaded spot is ideal, such as a north-facing balcony receiving morning or evening light. Acclimatise the poinsettia gradually to wind and brighter conditions: leave it in light shade for a few days first, then slowly move it into a brighter position.

Autumn trick for red bracts

For the decorative bracts to colour up again towards the end of the year, the poinsettia needs long nights from autumn onwards. Around 8–10 weeks of roughly 14 hours of darkness each day is enough. Covering it with a box in the evening or placing it in a windowless room with no stray light both work well. During the day, it should remain bright but out of direct sunshine.

The most common mistakes – and how to avoid them

• Too much water in March: Keep it almost dry rather than watering “just in case”.
• Draughts and radiator air: Cool, consistent conditions improve stability and reduce leaf drop.
• Direct sunshine through glass: This can scorch the leaves; indirect light is a better choice.
• The wrong pot: Without drainage holes, water collects and root damage becomes likely.
• Moving up too far in pot size: Go up by only one size, so that excess compost does not stay wet.

Why bracts are so spectacular – and what causes them

The poinsettia’s apparent “flowers” are actually coloured bracts. Its true flowers are the inconspicuous structures at the centre. The colour change is controlled by day length: as a short-day plant, Euphorbia pulcherrima responds to long autumn nights by forming flower buds and colouring its bracts. Keeping it vigorous in spring gives it a much better chance of producing a strong display of colour in autumn.

Extra tips for everyday care and safety

The milky sap may irritate skin. Wear gloves when cutting the plant and avoid contact with the eyes. For pets, eating larger quantities can lead to stomach upset. Keep the pot out of reach of cats and dogs.

A useful care idea is to keep a watering calendar. For example, create three columns – date, moisture test passed (yes/no), fertiliser. This keeps care consistent without slipping back into the old habit of overenthusiastic watering.

Mini plan for March to June

• March: Keep it cool, water very sparingly, remove faded leaves and be patient.
• April: Use a new pot with drainage, fresh compost, a bright position and moderate watering.
• May: Water regularly but moderately; fertilise every two to three weeks.
• June: Move it outdoors into partial shade, gradually acclimatising it to outdoor conditions.

There is no need for a conclusion: respecting the resting phase in March and restarting gently in April gives a poinsettia the best chance of a strong summer. By late autumn, the route to red bracts is then much shorter – without needing to buy a new plant for Advent.