Why Is My Poinsettia Dropping Leaves?
When the drop started tells you most of what you need to know. Here are the causes in the order they show up in a Canadian home, and what to do about each.
Why is my poinsettia dropping leaves? Nearly always one of five things: cold, too much water, dry air, too little light, or simple age. A poinsettia is a tropical shrub from Mexico. It reacts to stress by shedding leaves, and it often does so days after the stress happened, which is why the cause is so hard to spot.
The good news is that leaf drop rarely means the plant is dying. It means it is losing some of its display. Find the cause, fix it, and the plant can usually hold the leaves and bracts it still has through the holidays.
The short answer: drop that starts within about ten days of buying is usually cold damage from the trip home. Yellow lower leaves with wet mix mean the foil wrap is holding water. Leaves falling on the window side mean cold glass. Crisp brown edges point to dry furnace air. Slow loss in February or March is normal age. Fallen leaves will not grow back before spring.
Find the Cause From the Timing
| When it started | What you see | Most likely cause |
|---|---|---|
| 3–10 days after buying | Leaves yellow, curl and fall all over the plant | Cold on the trip home |
| First week or two | Droopy leaves, bracts falling, plant arrived tightly sleeved | Stress at the store |
| Any time | Lower leaves yellow first, mix wet, water in the wrap | Overwatering |
| Any time | Whole plant wilts, mix dry, pot light | Underwatering |
| After a cold night | Leaves on one side, near the window or a door | Cold glass or a draft |
| January | Crisp brown edges, then drop | Dry air from the furnace |
| Several weeks in | Lower leaves pale and fall in a dim room | Too little light |
| Any time | Sticky leaves, tiny white insects when touched | Whitefly |
| February–March | Gradual loss from the bottom up, small yellow flowers gone | Normal end of season |
1. Cold on the Way Home
Poinsettia shows stress below about 10 °C, and Mississippi State University Extension says never to let it drop below that. This is cold injury, not frost. In a Canadian November or December the walk from the shop to the car is enough, and so is ten minutes in a car that has not warmed up. The plant looks fine when you set it down. The leaves yellow and fall several days later.
What to do: nothing will bring those leaves back. Keep the plant in a bright, warm spot and water it correctly, and it will usually hold what is left. For the next one, ask for a full sleeve over the top, warm the car first, keep the plant in the cabin, and make it your last stop. The bringing plants home in winter guide covers the trip in detail.
2. Stress Before You Bought It
Mississippi State Extension tells buyers to skip plants that have sat in plastic sleeves for several days, and plants with drooping, wilted or faded leaves. A sleeved plant packed tightly with others for days in a warm truck or store has been under stress before it reaches you, and it often drops leaves and bracts soon after.
What to do: take the sleeve off as soon as you are home and give the plant space and light. When you buy, look at the small yellow-green flowers at the centre of the bracts. Mississippi State says to choose plants where they are unopened or only partly open; a plant that has already shed them is near the end of its display. Avoid plants displayed near an automatic door.
3. Too Much Water (and the Foil Wrap)
Mississippi State Extension names overwatering as a major cause of early leaf and bract drop. The decorative foil wrap has no drainage, so water collects in the bottom and the roots sit in it. The lower leaves turn yellow and drop first, and the plant can wilt in wet soil because rotting roots cannot take up water.
What to do: lift the pot out, tip out any water, let the pot drain, and put holes in the base of the wrap. Water only when the top 2–3 cm of mix is dry. The whole method is in watering poinsettias.
The surface of a poinsettia pot can feel dry while the roots at the bottom are soaked. A probe reads the root zone, which tells you whether leaf drop is coming from too much water or too little before you make it worse.
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4. Too Little Water
Peat-based mix in a small pot dries quickly in a warm house, and a plant that wilts hard and repeatedly will shed leaves. The difference from overwatering is the mix: dry, light, shrinking from the sides of the pot. What to do: water slowly until it drains, let it soak in, and check every day or two from then on. If the mix has dried so hard that water runs straight through, stand the pot in a bowl of water for 15 minutes, then drain it well.
5. Drafts and Cold Glass
Mississippi State Extension says to keep poinsettias away from drafts, heating and cooling vents, and heaters, and to keep bracts off cold windowpanes. On a −20 °C night the inside of a window can be well below 10 °C, and a leaf resting on it gets the same cold injury as the trip home. That is why leaves often fall on one side only. What to do: pull the plant 15–30 cm back from the glass at night, and away from any exterior door that opens through the day.
6. Dry Furnace Air
Forced-air heating dries the air a great deal in a Canadian January. On a poinsettia it shows first as crisp brown edges on leaves and bracts, then as leaf drop on a plant that is otherwise watered correctly and nowhere cold. A spot right above or beside a heat vent makes it much worse. What to do: move it out of the warm air stream, group it with other plants, and run a humidifier in the room if the air is very dry.
If your poinsettia is browning at the edges in a dry, furnace-heated room, a small cool-mist humidifier run in that room raises the humidity around the plant. It helps every other tropical houseplant in the same room too.
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7. Too Little Light
Mississippi State Extension recommends bright, indirect light indoors. A poinsettia set on a coffee table in the middle of a room in December gets very little, and over a few weeks it drops lower leaves it cannot support. What to do: move it to the brightest window you have, back from the glass. Canadian winter days are short, so a south or west window is a better choice than a decorative spot across the room.
8. Whitefly
Mississippi State Extension tells buyers to check the undersides of leaves for whiteflies and aphids. Whitefly leaves a sticky film and yellowing, and a cloud of tiny white insects lifts off when you brush the plant. What to do: keep the plant away from your other houseplants, and treat early. Our houseplant problems guide has the routine.
9. It Is Simply at the End of Its Season
A poinsettia bought in late November is at the end of its display by February or March. Gradual loss of lower leaves at that point is normal, not a care mistake. You can compost it, or keep it and grow it on for next year. University of Illinois Extension suggests cutting back on water once about half the leaves have dropped. The full plan is in poinsettia after Christmas.
Poinsettia Leaf Drop FAQ
Why is my poinsettia dropping leaves?
The five common causes are cold, too much water, dry air, low light and age. In Canada, cold is the one most often missed: poinsettia is damaged below about 10 °C, and a few minutes in a parking lot or a cold car in December is enough. The leaves drop days later. Next most common is water trapped in the decorative foil wrap, which rots the roots. Look at when the drop started and where on the plant it is happening to tell them apart.
Why did my poinsettia drop its leaves a week after I bought it?
Almost always chilling on the way home, or a plant that was already stressed at the store. Cold damage shows up several days after the exposure, so the plant looks fine on the first day. Once it has happened there is no cure; keep the plant warm, bright and correctly watered and it can keep the leaves it still has.
Will a poinsettia grow its leaves back?
Not during the winter. The leaves and coloured bracts that fall will not be replaced until the plant starts growing again in spring. A plant with bare lower stems can still look good on top through the holidays. If you keep it, it will put out new leaves after it is cut back in spring.
Is it normal for a poinsettia to lose leaves in February?
Yes. A poinsettia bought in late November or December is at the end of its display by February or March, and gradual loss of lower leaves at that point is the plant finishing its season. University of Illinois Extension suggests reducing water once about half the leaves have dropped, if you plan to keep it.
Why are only the leaves on one side falling off?
Usually because that side is touching or near cold window glass, or facing a door that opens to the outside. On a cold night a pane can be far below room temperature. Move the plant back from the glass at night.
Can overwatering make a poinsettia drop leaves?
Yes. Mississippi State Extension names overwatering as a major cause of early leaf and bract drop. The usual cause is the foil or plastic wrap, which has no drainage and holds water against the bottom of the pot. Empty the wrap, let the pot drain, and water only when the top 2 to 3 cm of mix is dry.
Do poinsettias drop leaves from dry air?
They can. Forced-air heating can drop indoor humidity very low in a Canadian January. Dry air shows as crisp brown edges on leaves and bracts, then drop. Keep the plant away from heat vents, group it with other plants, or run a humidifier in the room.
Sources
- Mississippi State University Extension, Selecting and Maintaining Poinsettias — stress below 10 °C, drafts and cold panes, overwatering and leaf drop, choosing a plant, sleeves, pests, light.
- University of Illinois Extension, Poinsettia Care After the Holidays — reducing water once about half the leaves have dropped.