Carlos Aguilar, Tecmanic

Updated November 9, 2026

Poinsettia Care: How to Keep Your Poinsettia Alive Through the Holidays (and After)

Water a poinsettia when the soil surface, or the top of the soil, is dry. Never let the pot sit in excess water, and never leave it in a foil wrapper full of water. Keep it away from cold drafts and heat vents, and give it a bright window.

Poinsettia care basics

Light, water, and temperature are not one shared figure across extension pages. Each row below is that source’s own range.

Light

These are separate statements. This page does not choose indirect light or direct light.

• Clemson University Extension: “at least 6 hours of bright, indirect sunlight each day. Putting it in direct sunlight may fade the color of the bracts.”
• Oklahoma State University Extension: “at least six to eight hours of direct natural or artificial light.”
• University of Minnesota Extension: “Put in a south, east or west window where the plant will receive bright daylight.”
• Iowa State University Extension: “Place it near a sunny window or other well-lit area. Do not let the plant touch the cold window pane.”

Water

• Iowa State University Extension says to water “when the soil surface becomes dry to the touch… until water begins to flow out the bottom of the pot.” Remove the pot cover, water in the sink, then put it back.
• Purdue University Extension says to water “when the top inch of soil feels dry to the touch.”
• University of Minnesota Extension: “Never allow poinsettia pots to sit in excess water.”
• Clemson University Extension: “Never let the potting mixture completely dry out and never let the plant sit in standing water.”

Temperature

Extension guides recommend roughly 60–70°F (Iowa State, Oklahoma State) or 65–70°F (Minnesota, Wisconsin). Keep it away from drafts and heat vents; below 50°F it can be damaged (Minnesota, Clemson).

Iowa State says 60–70°F. Minnesota and one Wisconsin Extension page say 65–70°F. Another Wisconsin Extension page says 60–68°F and says to avoid temperatures above 75°F. The two Wisconsin pages are poinsettia care and dependable houseplants. This page does not merge those two ranges. Clemson says daytime temperatures “should not exceed 70 °F.” Oklahoma State says 70°F or below, down to 60°F. Minnesota and Clemson say the plant can be damaged below 50°F.

Humidity

These notes are qualitative. This page does not give a humidity percentage.

• Purdue mentions dry indoor heat and a humidifier or a pebble tray.
• Oklahoma State says grouping the plant with other houseplants raises humidity.
• Clemson says keep it away from dry air from appliances, fireplaces, or ducts.

Why poinsettia leaves drop or turn yellow

Each line is symptom, then the cause that source names, then the change that same set of notes supports.

• Lower leaves turn yellow and drop. Iowa State says overwatering does this. Water when the soil surface becomes dry to the touch, until water flows out the bottom, and do not leave the pot sitting in water.
• Leaves curl and drop. Iowa State says dryness does this. Clemson says never let the potting mixture completely dry out.
• Leaves drop. Iowa State also names furnace registers and temperature swings. Keep the plant away from drafts and heat vents.
• Leaves or bracts wilt or turn black. Iowa State says cold can do this. Minnesota and Clemson say the plant can be damaged below 50°F.
• Leaves turn yellow and bracts fade early. Clemson says excess heat does this, and that daytime temperatures “should not exceed 70 °F.”
• Leaves drop from cold, dim light, or poor nutrition. Clemson lists temperatures below 50°F, poor light, and poor nutrition. This page does not add a fertilizer amount.
• Leaves drop before the bracts. Oklahoma State says low light does this. That page calls for at least six to eight hours of direct natural or artificial light.
• Leaves wilt, turn yellow, and drop. Oklahoma State says overwatering can do this through root rot. Do not leave the pot in standing water.

Are poinsettias poisonous to cats and dogs?

The ASPCA lists poinsettia as toxic to dogs and cats. It says the sap is irritating to the mouth and stomach and sometimes causes vomiting, but is ‘generally over-rated in toxicity.’ If your pet eats some, call your vet or a pet poison hotline.

The ASPCA poinsettia listing also gives these details:

• Scientific name: Euphorbia pulcherrima
• Family: Euphorbiaceae
• Toxicity: “Toxic to Dogs, Toxic to Cats, Toxic to Horses”
• Toxic principles: “Irritant sap”
• Clinical signs: “Irritating to the mouth and stomach, sometimes causing vomiting, but generally over-rated in toxicity.”

That page lists (888) 426-4435 and notes a consultation fee may apply.

Keeping a poinsettia after the holidays

Getting bracts to color again takes a spring cut-back and long nights. Cut-back heights stay with the source that published them. They are not combined into one height.

Spring cut-back

• Minnesota: about 5 inches, around Valentine’s Day.
• Wisconsin Extension: 5–6 inches, in late February.
• Iowa State and Oklahoma State: 4–6 inches, in March or March–April.
• Clemson: about 8 inches, in March–April.

Darkness to recolor

Extension guides call for 14 to 16 hours of complete darkness each night, starting in late September or early October, until the bracts color. Clemson and Wisconsin say 14 hours, Iowa State and Oklahoma State say 5 p.m. to 8 a.m., and Minnesota says 16 hours.

Start dates stay with each source:

• Minnesota: 16 hours, starting on or near September 21.
• Clemson: 14 hours, starting the first week of October.
• Wisconsin: at least 14 hours, starting late September or early October.
• Iowa State and Oklahoma State: complete darkness from 5 p.m. to 8 a.m., from early or late September or early October, until the bracts color.

Not sure it’s a poinsettia, or got a sick plant?

If you are not sure the plant is a poinsettia, or the one you have is already dropping leaves, Plantsnap Plant Identifier by Tecmanic can identify it from a photo and show a confidence level. After the identification, the app shows care notes. You can also photograph a visible problem. Save the plant to a list that syncs with iCloud.

The product page is Plantsnap Plant Identifier. Download Plantsnap Plant Identifier by Tecmanic on the App Store.

FAQ

When should I water a poinsettia?

Iowa State University Extension says to water when the soil surface becomes dry to the touch, until water begins to flow out the bottom of the pot. Remove the pot cover, water in the sink, then put the cover back. Purdue University Extension says to water when the top inch of soil feels dry to the touch. University of Minnesota Extension says never allow poinsettia pots to sit in excess water. Clemson University Extension says never let the potting mixture completely dry out and never let the plant sit in standing water.

What temperature should a poinsettia be kept at?

Extension guides recommend roughly 60–70°F (Iowa State, Oklahoma State) or 65–70°F (Minnesota, Wisconsin). Keep it away from drafts and heat vents; below 50°F it can be damaged (Minnesota, Clemson). Another Wisconsin page says 60–68°F and says to avoid temperatures above 75°F. Clemson says daytime temperatures should not exceed 70 °F. Oklahoma State says 70°F or below, down to 60°F.

Are poinsettias poisonous to cats and dogs?

The ASPCA lists poinsettia as toxic to dogs and cats. It says the sap is irritating to the mouth and stomach and sometimes causes vomiting, but is ‘generally over-rated in toxicity.’ If your pet eats some, call your vet or a pet poison hotline.

Does a poinsettia need direct or indirect light?

Extension sources do not agree, so this page does not pick one. Clemson University Extension says at least 6 hours of bright, indirect sunlight each day, and that putting it in direct sunlight may fade the color of the bracts. Oklahoma State University Extension says at least six to eight hours of direct natural or artificial light. University of Minnesota Extension says to put it in a south, east, or west window where the plant will receive bright daylight. Iowa State University Extension says to place it near a sunny window or other well-lit area, and not to let the plant touch the cold window pane.