How to Care for Poinsettias

Updated September 2026 · Garden Advice Guide

Give a poinsettia six hours of bright, indirect light, keep the room between 60 and 70°F, water only when the top inch of soil feels dry, and keep it away from drafts, heat vents and cold window glass. Do those four things and the red bracts hold their color for two months or more. Most poinsettias that die in January were killed by one of two things: they sat in water inside the foil sleeve, or they took a cold hit on the trip home from the store.

That is the short version of how to care for poinsettias. The rest of this page covers the details that trip people up, including the honest answer on toxicity and the dark-period routine that brings the color back next December.

Not sure if it's thirsty or drowning? Use our free watering guide for the container lift test and a symptom table that tells overwatering from underwatering.

Updated September 2026

What You're Actually Looking At

The red, pink, white or marbled "petals" on a poinsettia aren't petals at all. They're bracts, which are modified leaves. The true flowers are the little yellow-green beads clustered in the middle of each bract rosette. Botanists call them cyathia.

This matters when you're buying. A plant whose cyathia are still tight, green and closed has weeks of display ahead of it. One that's shedding yellow pollen, or whose centers have gone brown and hollow, is already past its peak and will start dropping bracts soon no matter how well you treat it. Pick the plant with the freshest centers, not the biggest bracts.

Two more things to check in the store. Skip any plant sitting near the automatic doors, because every gust of December air outside has been damaging it for days. And lift the pot: if it's dripping wet and heavy, it has probably been overwatered on the shelf, and root rot may already be underway.

Poinsettia Sunlight Requirements

Poinsettias are native to the dry hillsides of Mexico, and they want a lot of light. Indoors, that means the brightest spot you have that isn't a heat trap.

• Best: an east, west or south window with a sheer curtain, or set back a couple of feet from an uncovered south window. Aim for six hours of bright light.
• Fine for a few weeks: a bright room without direct sun. The bracts will hold, but the plant won't grow much.
• Trouble: a dim hallway, a bathroom with one small window, or the center of a large room. Lower leaves yellow and drop within two or three weeks.

One rule beats all others: the leaves must never touch the glass. A window pane on a January night can be 20 or 30 degrees colder than the room, and every leaf pressed against it will be damaged by morning. Set the pot a hand's width back.

Temperature and Drafts: The Cold Hit That Kills Most Poinsettias

Poinsettias are tropical plants that dislike anything below 50°F, and they react to a cold shock by dropping leaves a few days later, when you've long forgotten the cause. This is why so many plants seem fine for a week and then collapse.

The comfortable range is 65 to 70°F by day and no lower than 60°F at night. Here is where the cold hits come from:

If a plant does get chilled, don't panic. Put it in its proper spot, water normally, and wait. It may drop a third of its leaves and then stabilize. The bracts usually stay.

Poinsettia How to Water: The Foil Sleeve Problem

That decorative foil around the pot is the number one poinsettia killer. It has no drain hole. You water, the excess collects in the bottom, and the roots sit in a puddle. Within two weeks the lower leaves yellow and drop, and because that looks like thirst, most people respond with more water.

The fix takes ten seconds. Either punch three or four holes in the bottom of the foil and stand the pot on a saucer, or take the pot out of the foil to water it in the sink and put it back after it has drained. Do one or the other.

Then water like this:

1. Push a finger an inch into the soil. If it's still damp, wait a day and check again.
2. When it's dry at one inch, water slowly until it runs out of the drain holes.
3. Let it drain for 15 minutes. Empty the saucer. Never let the pot stand in water.
4. Use room-temperature water. Cold tap water straight onto the roots is a small cold shock every time.

A worked example. A standard 6-inch grower's pot in a 68°F room with normal winter humidity usually needs a thorough watering every 5 to 7 days. The same pot next to a heat vent might need it every 3 days. The same pot in a cool, dim room might go 10 days. This is why you check the soil rather than follow a calendar. The watering guide has a lift test that works well here: lift the pot right after a good watering, then lift it again a couple of days later. Once you know what "light" feels like, you'll never need the finger test again.

Why Is My Poinsettia Dying? Leaf Drop Decoded

"Why is my poinsettia dying" is really "why are the leaves falling off," and there are only a handful of answers. Work through them in this order:

1. Cold shock in the last week. Trip home, drafty doorway, cold glass. The drop is delayed, so think back.
2. Standing water. Check the foil. If the bottom is wet, this is it.
3. Dry heat. Any plant within six feet of a forced-air vent, radiator or fireplace.
4. Too little light. Leaves drop from the bottom up, slowly, over weeks, and the plant looks stretched.
5. Natural aging. By late January, a plant bought in mid-November has been in color for ten weeks or more. Losing lower leaves at that point is normal.

Leaf drop from causes 1 through 4 stops within a week or two of fixing the cause. If you want to know how to keep poinsettia leaves from falling off in the first place, the answer is the spot you choose on day one: bright, warm, away from doors and vents, with holes in the foil.

Are Poinsettias Poisonous? What Poison Control and the ASPCA Actually Say

This is the myth that refuses to die, so here is what the actual sources say.

The ASPCA Animal Poison Control Center lists poinsettia as mildly toxic to cats and dogs. Its listed effects are irritation of the mouth and stomach, sometimes with vomiting. That's the whole entry. It is not on the ASPCA's list of plants that cause serious poisoning, unlike lilies or amaryllis bulbs.

For people, the National Capital Poison Center puts it plainly: poinsettias are not deadly, and a child who eats a leaf might get an upset stomach at worst. The milky sap can irritate skin, especially in people with latex sensitivity, so wash your hands after pruning.

So the accurate statement is: keep it out of reach of a pet that chews plants, because a mouthful will make them drool and maybe vomit, but this is not an emergency plant. If you want a holiday plant that the ASPCA lists as non-toxic, the Christmas cactus is your answer.

How to Care for Poinsettias After Christmas

Most people toss the plant in January. If you'd rather keep it, the rest of the year looks like this. The dates assume you want color again by Christmas.

The August pinch is the last one. Any pinch after that removes the shoots that would carry December's color.

How to Get Poinsettia to Rebloom: The Dark-Period Schedule

Poinsettias are short-day plants. They set their colored bracts only after several weeks of long, uninterrupted nights, which is why they color up naturally in Mexico in December. In a house with lamps on until 11 pm, that never happens. You have to fake it.

Here's the routine, starting around October 1:

1. Every evening at about 5 pm, put the plant somewhere with total darkness: a closet, a cabinet, or under a cardboard box that lets no light through.
2. Every morning at about 8 am, bring it back out to its bright window. It needs the daytime light as much as the nighttime dark.
3. Repeat every single day for 8 to 10 weeks. That's 14 hours of darkness and 10 hours of light.
4. Keep the temperature at 60 to 70°F during the dark hours. Above 70°F at night, bracts color poorly; a cold closet below 55°F stalls it.
5. Water normally. Yes, you still water poinsettias when they're in the dark. Check the top inch on the mornings it's out, same as always. Keep fertilizing at half strength until color shows, then stop.
6. Stop the treatment once the bracts are fully colored, usually in the last week of November or the first week of December.

The part that ruins most attempts: the dark has to be complete. A closet with a light leak under the door, a box you lift to peek, a hallway lamp switched on for two minutes at 9 pm. Any of those can reset the plant's clock for that night. Streetlights through a window count too. If you want to check the plant, do it in the morning.

A worked example, counted back from Christmas. Say you want full color on December 20. Coloring takes about 8 weeks of short days, so the dark treatment must start no later than October 25, and starting October 1 gives you a comfortable margin. Working further back: the last pinch by August 15, the outdoor move in late May, the hard cutback in late March. Miss the October start by two weeks and you get color in mid-December. Miss it by a month and it's January.

If you don't want to move a plant twice a day for two months, you have a second option. Put it in a spare room with no lamps and blackout blinds, where the natural night in October is already 12 to 13 hours long, and simply never turn a light on in there. It's slower and less reliable than the closet, but it works for a lot of people.

Can You Plant Poinsettia Outside?

In most of the country, no, not permanently. Poinsettias are perennial shrubs only where winter never freezes, which in USDA terms means zones 10 and 11, and a gamble in 9b. In south Florida, coastal southern California, south Texas and Hawaii they grow into 8 to 10 foot hedges that color up every December without any help from you. Check where you sit with our growing zones lookup. If the front step needs something that will actually take your winter, our front door winter planter ideas page covers cut greens and living evergreens rated two zones colder than the ground.

Everywhere else, "outside" means a summer vacation in the pot, as in the calendar above, with the plant back indoors before the first night below 55°F. Even one frost kills the top growth outright.

If you're in zone 10 or 11 and want to plant one in the ground:

• Choose a spot with full sun and shelter from wind.
• Plant it where no porch light, streetlight or security light reaches it at night, or it will never color up. This catches a lot of people.
• Prune hard in early spring, and pinch through summer just as you would in a pot.
• Water deeply during dry spells; established plants are fairly drought tolerant.

The Rest of the Holiday Plant Cluster

Poinsettias are one of a small group of plants that show up in December and get thrown away in January for no good reason. The others have completely different needs, so we've given each its own page:

• Christmas cactus plant care: the one that needs cool nights, not dark closets, to bloom, and the one the ASPCA lists as non-toxic to pets.
• Amaryllis care: a bulb on a strict timeline, where the after-bloom months decide whether it comes back.
• How to force paperwhites: the December bulb that needs no chilling at all, just water, gravel and about four weeks.

The cut greens around them last the season too, if you condition them properly, which our guide to making a fresh greenery garland walks through.

And if your poinsettia came home with fine webbing and stippled leaves, that's a pest, not a care problem. Our spider mite guide covers the water-first fix that works on houseplants.

FAQ

How often should I water a poinsettia?

Whenever the top inch of soil is dry, which in a normal winter living room works out to about once a week for a 6-inch pot. Near a heat source it can be every three days. Water thoroughly until it drains, then let it drain completely. Never leave it standing in water in the foil sleeve.

How long do poinsettias last indoors?

A healthy plant bought with tight green centers holds its bracts for 8 to 12 weeks in the right spot, which takes you from Thanksgiving to Valentine's Day. Plants bought with pollen already shed, or exposed to cold on the way home, last a fraction of that.

Why are my poinsettia leaves turning yellow and falling off?

Usually water sitting in the foil sleeve, or a cold draft in the last week. Check the foil first. If the bottom is wet, punch holes in it and let the top inch of soil dry before watering again. If the soil is fine, think about where the plant has been: doorway, cold car, window glass.

Are poinsettias poisonous to cats and dogs?

The ASPCA lists them as mildly toxic: mouth and stomach irritation, sometimes vomiting, and that's it. They are not in the category of seriously poisonous plants. Keep the plant where a chewer can't reach it and you're fine. The Christmas cactus is listed as non-toxic if you want a safer option.

Can I keep my poinsettia in the dark all day to make it rebloom?

No. It needs 14 hours of complete darkness and 10 hours of bright light every day for 8 to 10 weeks, starting around October 1. All-day darkness starves the plant instead of triggering color. And the dark must be total; a single light leak resets that night.

Should I fertilize my poinsettia while it's in bloom?

No. A plant in full color needs nothing but light, warmth and correct watering. Start a half-strength balanced fertilizer after you cut it back in spring, feed every 2 to 3 weeks through summer and into the dark period, and stop once the bracts color up.

Can I put my poinsettia outside in summer?

Yes, and it helps. Once nights stay above 55°F, move it to a spot with morning sun and afternoon shade, keep pinching the shoots through mid-August, and bring it back inside in early September before nights cool. Check it for insects before it comes in.