Holiday Rebloom Desk: get poinsettias and holiday cacti to bloom again

Poinsettias, Thanksgiving and Christmas cactus, and kalanchoe bloom when nights get long. Pick a plant and a bloom date, and the desk says when to start long or cool nights, what to do each night, and what to expect if you are starting late. It also tells the three holiday cacti apart by their stem segments and checks common reasons for no bloom or bud drop. Your list saves on your device. No account needed.

When to start

Windows are counted back from the bloom date using extension timing. Ranges are wide because variety, light, and room temperature shift bloom.

Plant	What triggers bloom	Start for Thanksgiving, Nov 26, 2026	Start for Christmas, Dec 25, 2026
Poinsettia	14 hours of total darkness nightly, 6 to 8 hours of bright light, 60 to 70 F	Late this year. Start now for later bloom	Late this year. Start now for later bloom
Thanksgiving cactus	14 hour nights, or nights of 50 to 59 F, kept under 70 F	Late this year. Start now for later bloom	Now, by Nov 13, 2026
Christmas cactus	14 hour nights, or nights of 50 to 59 F, kept under 70 F	Late this year. Start now for later bloom	Now, by Nov 13, 2026
Kalanchoe	Six weeks of 14 hour nights, nights 60 to 65 F	Late this year. Start now for later bloom	Late this year. Start now for later bloom
Amaryllis, old bulb	8 to 10 weeks at 50 to 55 F, then 70 to 75 F	Late this year. Start now for later bloom	Late this year. Start now for later bloom

Buying and caring for a holiday poinsettia

Already in color? Start here. The rebloom planner is for preparing next season.

Choose a healthy plant

Look for dark green foliage down to the soil line and bright, undamaged bracts. The yellow central flowers, called cyathia, should be unopened or just opening. Avoid wilted plants, missing lower leaves, broken stems, torn bracts, or visible pests. Avoid plants kept in plastic sleeves for several days (Mississippi State, Iowa State).

Protect it on the trip home

Buy it at the end of your shopping trip, wrap it before taking it into the cold, and use a heated vehicle. Carefully remove the sleeve as soon as you get home. Iowa State suggests cutting the sleeve off rather than pulling it over the branches.

Give it light without drafts

Use a bright spot with indirect light. Keep the plant off cold window glass and away from doors, cold drafts, and heating vents (Mississippi State, Illinois). Avoid plants showing stress or leaf drop when shopping (Iowa State).

Keep temperatures steady

Iowa State recommends 60 to 70 F indoors. Mississippi State warns not to let temperatures drop below 50 F. Illinois recommends about 55 F at night, so 50 F is a lower safety limit, not a target.

Water, then let it drain

Check the soil daily and water when the surface feels dry. Remove the decorative cover, water until it drains from the pot, and discard excess water before replacing the cover. Do not leave the roots in soggy soil or standing water (Iowa State, Mississippi State).

Keeping it for next year? How to get a poinsettia to turn red

Poinsettia

Starting about Oct 1, give 14 hours of total darkness every night, such as 5 pm to 7 am in a closet or under a box, and 6 to 8 hours of bright light by day, for 8 to 10 weeks. Even a brief light leak delays color. Bracts begin to color by late November, with full color by Christmas (Clemson, Mississippi State, Maryland).

Thanksgiving and Christmas cactus

They set buds with 14 hour nights for about 6 weeks, or with cool nights of 50 to 59 F regardless of day length. Nights above 65 F make bloom unlikely, and above 70 F stops it. Once buds show, do not move the plant until the first flowers open (Clemson, Minnesota, Iowa State). Thanksgiving cactus has pointed teeth on its stem segments. Christmas cactus has rounded scallops. Easter cactus has smooth segments with bristles at the tips and blooms March to May.

Kalanchoe, moth orchid, and amaryllis

Kalanchoe needs about six weeks of 14 hour nights to form buds (Iowa State). Large-flowered moth orchids start a spike after 2 to 3 weeks of nights about 15 F cooler than days (American Orchid Society). An old amaryllis bulb needs 8 to 10 weeks at 50 to 55 F before it can bloom again (Iowa State). New amaryllis bulbs need no rest: time them on the Bulb Forcing Desk.

Pets

The ASPCA lists Christmas, Thanksgiving, and Easter cactus and moth orchids as non-toxic to dogs and cats. Poinsettia is listed as toxic but mild: the sap irritates the mouth and stomach. Kalanchoe and amaryllis are toxic. See pet-safe plants.

Guides

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