Poinsettia Tree: What It Is and How to Care for It
A tree-form poinsettia is the same plant as a pot poinsettia, trained to one tall stem. It needs the same care, plus more water, more support, and a little more thought about where it stands.
A poinsettia tree is a poinsettia grown on a single bare trunk with a round head of leaves and red, pink or white bracts on top. Texas A&M AgriLife’s poinsettia producers’ guide describes tree forms with a trunk of about 60–90 cm and a flowering head 30–35 cm across. Smaller tabletop versions are sold too.
They are less common than ordinary pot plants for good reason. The same guide notes that trees need a lengthy growing season and are extremely difficult to ship, which is why they turn up mostly at independent garden centres rather than grocery stores. If you have one, it was grown for most of a year to reach that shape.
The short answer: care for a poinsettia tree like any poinsettia — bright light, about 16–22 °C, never below 10 °C, no drafts, and water when the top 2–3 cm is dry. The differences: it uses more water, so check every day or two; it is top-heavy, so keep the stake and use a heavy outer pot; and its head sits higher, closer to cold glass and vents.
How a Poinsettia Tree Is Made
In the wild in Mexico and Central America, Euphorbia pulcherrima is a large shrub that can grow a few metres tall. The holiday tree is not that wild form; it is a greenhouse plant shaped on purpose.
The grower starts the plant much earlier than an ordinary poinsettia, keeps one strong stem tied to a stake, and removes side shoots as they appear. Once the stem reaches the planned height, the top is pinched so it branches into a head, and the lower leaves are stripped from the trunk near the end. A Purdue trial reported in Greenhouse Grower found that staking and stem support added work for the grower and that repotting large tree forms was difficult. Both points matter at home too.
Bringing One Home in a Canadian Winter
Poinsettia shows stress below about 10 °C, according to Mississippi State University Extension, and a tree form is harder to protect than a small pot because the head sticks out of any bag. Ask the store to sleeve the whole plant, head included. Warm the car before you load it, lay it on the back seat or wedge it upright, and drive straight home. Do not leave it in the car while you run another errand.
Take the sleeve off once you are inside. Cold damage shows days later, as yellow leaves that drop, so a plant that looks fine on day one can still have been chilled. Our guide to bringing plants home in winter covers the trip.
Where to Put It
- Bright light. Mississippi State recommends bright, indirect light. Beside a south or west window is best in December. Turn the pot a quarter turn every few days so the head stays round.
- Off the glass. The head of a tree form is often right at window height. Leaves touching a cold pane get the same cold injury as the trip home. Keep it 15–30 cm back.
- Away from vents and doors. A tall plant can catch the stream from a wall or ceiling vent that would miss a small pot on a table. Mississippi State advises keeping poinsettias away from drafts, vents and heaters.
- Steady temperature. About 20–22 °C by day and 16–18 °C at night, according to Mississippi State. Cooler nights help the bracts last.
- Out of traffic. It is top-heavy. A spot where it can be brushed by a coat, a dog’s tail or a child will see it tipped over sooner or later.
Watering a Poinsettia Tree
A tree’s head carries far more leaves than its pot size suggests, so it uses water quickly, especially in a bright, warm room with dry furnace air. Check every day or two. Water when the top 2–3 cm is dry, until water runs from the holes, then empty the saucer or wrap. Never leave the pot standing in water.
The bigger pot can stay wet at the bottom while the surface dries, so lifting the pot, or a probe meter, tells you more than a finger does. The full method is in watering poinsettias.
A tree-form poinsettia sits in a deeper pot than a table plant, and the bottom can stay soaked while the surface is dry. A probe pushed halfway down reads where the roots are, so you can water a thirsty tree often without drowning it.
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Keeping It Upright
Leave the grower’s stake and ties in place. The trunk is young and soft, and the head is heavy. If the ties cut into the stem, loosen them rather than removing them. If there is no stake, add one beside the trunk and tie it in two places with soft plant ties.
Stand the plastic pot inside a heavier ceramic or clay outer pot, and add a few stones in the bottom of the outer pot if it still feels tippy. Do not repot it into a bigger pot over the holidays; as the Purdue trial found, moving a large tree form is awkward and the root disturbance is not worth it.
If your tree came without a stake, or the trunk is leaning, a bamboo cane pushed into the pot beside the trunk and two soft ties hold it straight. Choose a stake that reaches just under the head, and soft or padded ties so they do not cut into the stem.
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After the Holidays
A tree form can hold its colour into February or March with good care. After that, keeping the shape is harder than keeping the plant. The usual advice for poinsettias is to cut every stem back to 10–15 cm in spring; on a tree that would cut off the head. Instead, cut the branches of the head back by about half, keep the trunk, and rub off any shoots that sprout from the trunk or the soil.
Give it strong light or a sheltered spot outdoors for the summer once nights stay warm, pinch the head into shape until mid-August, and give it the same 14-hour dark nights from about October 1. A tree is too tall for a box, so a closet or a room no one enters after dark works better. Every step is in poinsettia after Christmas, and the date your city’s nights reach 14 hours is in the poinsettia care guide.
Common Problems on Tree Forms
The head drops leaves on one side
That side is against cold glass, or catching a draft or vent. Move the plant and turn it regularly.
The whole head wilts suddenly
Check the mix. Dry and light means it ran out of water, which happens fast on a tree; soak it. Wet and heavy means the roots are sitting in water; empty the wrap and let it drain.
Green shoots sprouting from the trunk
Rub them off while they are small. Left on, they take energy from the head and spoil the tree shape. For other leaf problems, see why is my poinsettia dropping leaves.
Pets and Children
The ASPCA lists poinsettia as toxic to cats and dogs. Pet Poison Helpline rates it mildly toxic: the milky sap can cause drooling, vomiting and, rarely, diarrhea, and can irritate skin and eyes. A tree’s height can keep the leaves away from a dog, but a tipped-over tree puts the whole head on the floor, which is one more reason to give it a heavy pot. If a pet eats some, call your vet or a pet poison line. See holiday plants and pets for the other December plants.
Poinsettia Tree FAQ
What is a poinsettia tree?
A poinsettia trained by the grower onto a single bare stem with a round head of leaves and coloured bracts on top, like a small standard rose. Texas A&M AgriLife describes tree forms with a trunk of about 60 to 90 cm and a flowering head 30 to 35 cm across. It is the same plant as an ordinary potted poinsettia, grown into a different shape.
Do poinsettias grow into trees naturally?
In their native range in Mexico and Central America, poinsettias grow outdoors as large shrubs that can reach a few metres tall. A poinsettia tree sold for the holidays is not that; it is a pot plant trained to one stem by a greenhouse grower over a long growing season.
How do I care for a poinsettia tree?
The same way as a potted poinsettia, with three extra points. It uses more water because the head carries far more leaves, so check the pot every day or two. It is top-heavy, so keep the stake in place and stand it in a heavy outer pot where it cannot be knocked over. And its head sits higher, closer to cold window glass and ceiling or wall vents, so place it carefully. Keep it bright, between about 16 and 22 °C, and never below 10 °C.
How often do I water a poinsettia tree?
Whenever the top 2 to 3 cm of the mix is dry, which for a tree form in a warm, bright room can be every two or three days. Water until it drains, then empty the saucer or decorative wrap. Lifting the pot is the most reliable check, because the larger pot can stay wet at the bottom while the top dries.
Can I keep a poinsettia tree after Christmas?
You can keep it alive the same way as any poinsettia, but holding the tree shape is harder. Cut the head back lightly in spring rather than cutting the whole plant to the soil, remove any shoots that sprout from the trunk, and grow it in strong light for the summer. It then needs the same 14-hour dark nights from about October 1. Expect a looser head than the greenhouse grew.
Can I make my own poinsettia tree?
It can be done, but it takes a full growing season or more. Choose a vigorous plant, keep one strong upright stem tied to a stake, rub off side shoots on the lower trunk, and pinch the top once it reaches the height you want so the head branches out. Texas A&M notes that commercial trees need a lengthy growing season; at home, with Canada's short summers, plan on a small tree rather than a tall one.
Is a poinsettia tree toxic to pets?
The same as any poinsettia. The ASPCA lists poinsettia as toxic to cats and dogs, and Pet Poison Helpline rates it mildly toxic: the milky sap can cause drooling, vomiting and, rarely, diarrhea, and irritate skin and eyes. Its height can put it out of reach of a dog, but a cat may still climb to it.
Sources
- Texas A&M AgriLife Extension, Poinsettia Forms and Styles — tree trunk and head size, long growing season, difficult to ship.
- Purdue University trial reported in Greenhouse Grower, The Potential of Poinsettia Trees — staking and support, repotting large tree forms.
- Mississippi State University Extension, Selecting and Maintaining Poinsettias — light, temperature, drafts, watering.
- ASPCA Animal Poison Control, Poinsettia; Pet Poison Helpline, Poinsettia.