Gardening Houseplants Laidback Gardener Tip of the Day

Why is My Poinsettia Losing its Leaves?

There are many reasons why poinsettia leaves can start dropping off. Photo:

I’ve received several emails recently from gardeners struggling with poinsettias (Euphorbia pulcherrima) whose lower leaves turn yellow and drop off, often within days of purchase. Yet the poinsettia, while not necessarily the easiest houseplant of all, has the reputation of being able to “hold on” for at least a month or two if given reasonable care. Why then is yours losing its leaves so soon after you bought it?

A Symptom of Stress

Leaf drop in the poinsettia is a symptom of stress. The plant is not happy and shows its displeasure by dropping leaves. Usually, it’s the lower leaves that are sacrificed first. They turn yellow and off they fall. Then, if the cause of stress isn’t corrected, the leaf drop will gradually progress up the plant until it appears nearly naked, with only the colored bracts and a few green leaves on the top.

So much for the symptoms, but what causes this stress? Here are 10 possibilities.

Problem #1: The plant was exposed to cold

20151210BIn most areas, Christmas is the coldest time of the year, so when you purchase a poinsettia, just bringing it back from the store can stress it severely. Even a few minutes of exposure to temperatures below 10°C can cause leaves or bracts to fall off.

Solution: Always insist the salesperson carefully bag your poinsettia before you leave the store. And don’t place a poinsettia on a frozen seat in an icy car, but instead heat your car in advance.

Problem #2: It has been kept wrapped too long

20151210CPoinsettias give off a toxic gas called ethylene. In the open, this gas diffuses rapidly and causes no harm. But if you keep your plant inside a closed plant sleeve for a few days, the concentration increases and leaves and bracts will begin to fall.

Solution: Remove the poinsettia from its wrapping as soon as you get home. If you intend to wrap your poinsettia as a gift, do so just before you need it, not days ahead.

Problem #3: Carbon monoxide exposure

20151210DThe poinsettia is the canary in the coalmine of houseplants when it comes to carbon monoxide (CO), an odorless, tasteless toxic gas, reacting well before humans show the slightest symptom. If your plant starts to lose its leaves practically as soon as you bring it into your home, the level of carbon monoxide in your home may be too high.

Solution: Check the level of carbon monoxide in your home using a carbon monoxide alarm. If it goes off, leave your home immediately and call 9-1-1.

Problem #4: The air is too dry

Poinsettias tolerate dry air relatively well, especially compared to so many other indoor plants, but there is a limit. When the air is exceptionally dry, remaining at less than 30% almost all the time, the leaves begin to drop off, often browning at the margins or at the tip before they fall. If the soil dries out very quickly after a good watering, say in only 2 or 3 days, that’s another symptom that the air is very dry.

Solution: Increase the humidity using a humidifier or place the plant on a humidifying tray.

Problem #5: Insufficient water

Lack of water.

When you find your poinsettia wilting, with all its the leaves and bracts hanging limply like lettuce in the sun, and its soil is dry to the touch, it’s pretty obvious that it lacked water. Usually the foliage will recover its turgidity after a thorough watering, but… a few days later, the lower leaves begin to turn yellow and drop off. Do note that this leaf loss due to a lack of water is not necessarily your fault. The stress may have occurred in the store before you bought the plant, then, when you buy an apparently healthy poinsettia, leaf drop sets in a few days later. Note that box stores and supermarkets, especially, are not known for their proper maintenance of the plants they sell.

Solution: Water any poinsettia whose soil is dry to the touch and whose leaves have wilted to at least save it. Once it has recovered, learn how to water your poinsettia properly so it won’t happen again. Whenever the soil is dry to the touch, water deeply, enough so that the excess water flows into the saucer. Just to make sure the plant really did get enough water, even let the plant soak in the excess water for 15 to 20 minutes, then empty the saucer.

It’s important to understand that you can’t force a poinsettia to adapt to a specific watering schedule. The typical “I water once a week” method can never be counted on. At some point, you’ll almost always end up under- or overwatering the plant, depending on the conditions. This is because the same plant may well find a weekly watering quite adequate if it’s gray outside and fairly cool indoors, but then can wilt terribly the following week because it’s suddenly sunny and the window ledge became extra hot. And yet a week later, when the weather is exceptionally gray and cool, the potting mix might still be almost soaking wet a full week after the plant was watered. If watering needs vary so widely, it’s because indoor conditions change constantly.

Ideally you should check the soil every 3 or 4 days, pressing your index finger into the soil up to the 2nd joint: if the soil is dry, water well. If it is still wet, come back 3 or 4 days later and check again, watering only when needed. That is the key to successful watering almost any plant, not just the poinsettia! You may well find that the same plant can sometimes need watering after only 4 days under some circumstances and, at other times, only after 10 or 12 days.

Finally, note that mini-poinsettias, which are actually young cuttings grown in small pots and forced for early flowering, are especially susceptible to underwatering. Their tiny pots dry out quickly and it is best to check their growing mix every two days.

Problem #6: The plant was overwatered

Here overwatering has caused rot to set in.

It seems illogical, but a poinsettia will react the same way when it’s overwatered as when it’s underwatered: the foliage wilts and drops off. Why? If the potting mix remains overly wet for a long time, the roots begin to rot due to the lack of oxygen and when this happens, the foliage wilts, despite the abundance of water, since the roots are no longer there to absorb it.

Solution: It’s not easy to recuperate a poinsettia whose roots have begun to rot, because rot is a disease (Pythium) that spreads from dead or dying roots to living ones. It is probably best to simply replace any poinsettia suffering from rot.

Problem #7: It’s too hot or too cold in the room where you keep your poinsettia.

And an unhappy poinsettia will start to lose its leaves.

Solution: The ideal temperature for a poinsettia is between 60 and 75?C (15 and 24?C). If it is colder or warmer than that, especially over a long period, it’s best to move it to a spot more suitable to its needs

Problem #8: Lack of light

Poinsettias really need bright light with at least some direct sun.

This problem is usually seen only in the long run, because a poinsettia can usually take 7 or 8 weeks in the shade or partial shade before reacting negatively and starting to lose its lower leaves. That’s why you can use a poinsettia almost anywhere in the home over the holidays, even in a dark corner. But if you want your poinsettia to remain in good condition until spring, it will need good light.

Solution: After Christmas, place your poinsettia in a spot where it will receive adequate lighting, including at least a few hours of sun a day, such as near a sunny window.

Problem #9: Insect infestation

Whiteflies, small sucking insects found underneath the leaves.

Whiteflies love poinsettias, piercing the leaves to lap up their sap, thus causing their foliage to slowly turn yellow and then drop off. Spider mites, mealybugs and scale are other sap-sucking insects that also sometimes infest poinsettias and give similar results.

Solution: Usually, the plant was already infested in the store, so the first solution is of course to carefully inspect the plant before you buy it. Look especially under the leaves and at leaf axils, as that is where pests often hide. Different treatments, including sprays with insecticidal soap, neem oil, horticultural oil, rubbing alcohol, etc., can be used to control the invaders. And keep the plant isolated from your other houseplants so the infestation won’t spread.

Problem #10: Aging leaves

It is perfectly normal for a poinsettia to lose a leaf or two from time to time. That’s its way of getting rid of older, less functional leaves.

Solution: Just pick up the dead leaves!

Poinsettias Really Aren’t That Difficult

I hope the above list of problems and solutions didn’t scare you off, because, in fact, the majority of people who water their poinsettia correctly have no problem keeping it in good condition for at least a month or two. And those who, in addition, make sure it give it adequate light can even expect it to hold onto its beautiful bracts until May or even June for a full 6 months of beauty!

As for how to get your poinsettia to bloom again, an entirely different subject, here are some tips.

No, the poinsettia isn’t difficult to maintain, but like any plant, it still needs at least a bit of basic care to be happy. Give it what it needs and your poinsettia will repay you in spades!

18 comments on “Why is My Poinsettia Losing its Leaves?

  1. Anita Barker

    Thank you for your very useful info.

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  3. Pingback: Why Is My Poinsettia Dropping Its Leaves? All Answers -

  4. Su Silberman

    Hello; I bought a mini ponsietta a few days ago, immediately started to drop curled leaves! Should I repotted? What else can I do.? I live in South florida, I place it in a sunny window. Thanks!!!

    • I suggest returning it. If you just bought it, the problem probably started in the store.

      If you want to try and save it, yes, do repot into a larger pot (they don’t give those mini-poinsettias much room to grow!) and do water as soon as it starts to dry out. Don’t fertilize: it’s in shock at the moment. You can start that in spring. The sunny window will be perfect. But any leaves it has already lost won’t be replaced before spring (and the flowers, until next November or December), so if it doesn’t look good now, it won’t for a long time!

  5. I have my poinesetti for about 1 1/2 yr.but I need help I think I am going to lose my plant, after I brought it inside and I water thur and now the leaves are just droopy,everyday it looks worst ,please help me , I don’ t want to trash.

    • I’m afraid it sounds like water is no longer getting from the roots to the leaves. Maybe it was exposed to cold or too much water (which leads to rot). About the only thing you could do at this point is to try and take a cutting or two. I suggest, though, accepting that you’re going to lose your poinsettia and buying a new one. Plants die; it happens. It’s something gardeners have to learn to deal with.

  6. My plant is 1 1/2 years old I have it in my store it’s roughly 48” tall about 5 feet wide the leaves are mostly green but in seems like last couple of days I have a few yellow all over plant I am worried about it any tips

    • Yellow leaves? That could be normal. I suspect it’s probably outgrown its pot. You might need to repot into a larger container. Knock off about 1/3 of the old soil as you repot. Move the plant to a shadier spot for a week or so and water a bit more, as repotting is a bit stressful. Then move it back to its usual place.

  7. Janet Ralte

    Hi, your article has been very helpful. I bought 6 pots of beautiful poinsettia and kept them in the sun, i guess it was too hot. They lost their leaves. Winter sun is really hot here in India. 1 have shifted them in the shade. But i repotted 1 and it has died completely. The others are still not in good condition. Can i still save them somehow?

    • Poinsettias are tropical in origin, but from cooler mountainous areas of Mexico. If you keep them in partial shade (some morning sun) and don’t let them dry out, they should recuperate and form new leaves. Whether they reboom or not will depend on day length. The southern part of India may be too close to the equator to undergo any notable difference in day length, yet poinsettias need short days – a bit under 12 hours – to bloom.

      If poinsettias can do well in your climate, you ought to see them in people’s gardens. If you don’t, they probably aren’t adapted.

      • Janet Ralte

        Thank you so much for your prompt reply. I live in the north-east hilly part of India. And yes poinsettias do thrive well in our area. Its just me, its my firt time ever having one so i am so afraid of killing it even before Christmas.

        Your reply has given me hope, thank u so much

  8. gloria dietel

    Every year my son buys me a very large poinsettia plant. After a few days the leaves begin to drop. I keep it in room where the light is on all night. Could this be the problem? I have read all your recommendations and the plants are not in a draft or under or over watered. They stay healthy and bloom for weeks in churches and office where it is dark at night. Help me keep a blooming plant next Christmas

    • Leaving the lights on all night is not the cause of this problem: that really has no effect on the plant while it is blooming. I suspect the plant is underpotted. In a greenhouse under extremely high humidity, that’s not a problem, but in a home with drier air, it will be. Try this next year: when you get your new poinsettia, repot it in a pot a good 4 inches (10 cm) larger than the original. You don’t want to disturb the roots, so use the method described here:
      Best of luck!

    • Debi ketner

      BT his is what I read in the link “tips”.

      You see, we light our homes at night, extending the number of hours of daylight to 16, 17, or 18 hours a day. Yet what the plant really requires is no light at all from the end of the afternoon until the following morning. Even a single ray of light at the wrong time and it may not bloom.

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  10. I just received a very large one yesterday as a gift. Thanks for the tips. 🙂

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