I've had my poinsettia for about 2 years. Over the summer I accidentally left it in the car for a few hours, and it got really hot. Since then it has lost all its leaves and gotten really droopy, and the branches have turned brown. Is it possible to save it?
Several hours in temperatures of 120 or more can pretty much fry any plant, unfortunately. You can cut off the dead branches, water it well, and put it in shady place. If there's any life left in the roots, it will start to sprout new leaves after a few weeks. Read on for some more information: https://www.gardeningknowhow.com/plant-problems/environmental/how-to-tell-if-a-plant-is-dead-and-how-to-recover-an-almost-dead-plant.htm
Is it possible to regrow a broken off poinsettia branch? Thanks for your help.
Because the leaves are so thin, cuttings usually wilt before the stems develop roots; therefore, it can be somewhat difficult to try and root broken branches. However, if you want to try to propagate the broken stem, use only an inch or two of bare (green) stem with a couple small leaves, or tip cuttings, since these root much easier than the old, woody branches. Stick the cutting into a pot filled with damp potting mix and seal this inside a clear plastic bag. This will help retain moisture similar to a mini greenhouse. Place it in an area receiving bright, indirect light. In about 4-6 weeks, the cutting should be rooted and can be taken from the bag.
Here is more information: https://www.gardeningknowhow.com/ornamental/flowers/poinsettia/broken-poinsettia-stems.htm
Is a Poinsettia a rooted plant? Do they last for years, or does it just last a few months?
Yes, this shrub-like plant has roots and can last months or years given the proper growing conditions. For more information on growing these plants, these articles should help: https://www.gardeningknowhow.com/ornamental/flowers/poinsettia/poinsettia-care-how-do-you-take-care-of-poinsettias.htm
My poinsettias are planted in the ground. They have grown quite while since I planted them last year. Mine are still green but my neighbor's are red. What can I feed mine to make them turn red?
Reblooming a poinsettia can prove difficult, especially outdoors. Poinsettias require 14 hours of uninterrupted darkness every night during the month of October, when flower buds are developing. Any light exposure during any one night can result in a day's delay in your poinsettia's red color. Protect your poinsettia from light starting October 1 to attempt a rebloom. Since it's already December, your plant may not turn at all. That said, you could TRY covering the poinsettia plant each night (with a box turned over top of it - make sure it's large enough) to block out any light. Do this for the remainder of the month and keep checking to see if this helps any with the color.
My red poinsettia are shriveling. They are in a well lit room. They have been watered.
Perhaps they have been too-well watered. If you were to water them every day, for instance, they would get root rot and start to brown, shrivel, and probably die. Do not water again if the soil has water dripping out if you pinch some of the soil between your fingers. Wait until a pinch of soil will stick together when you stop pinching, but fall apart when you touch it. This article has more information: https://www.gardeningknowhow.com/ornamental/flowers/poinsettia/poinsettia-care-how-do-you-take-care-of-poinsettias.htm
Why do poinsettia buds fall off? We only had 4 buds - one is blooming, 3 fell off as buds.
What are generally regarded as flowers on poinsettia are actually leaves. Their flower buds are very small.
Regardless of whether you meant flower buds or the distinctive red leaves, there are many reasons they can fall and all are related to stress. This time of year, I would suspect the likely culprits are either the plant is underwatered or is being exposed to a mild chilly draft.
I bought the plant at Christmas and when the blossoms died I removed them and placed the plant in a sunny window. Now the leaves are turning red. What's happening?
The red leaves are maturing and assuming your plant originally was a red color it is entering another growing cycle.
Here is a link about the care of poinsettia.