Christmas cactus care

Christmas cactus is a tropical jungle cactus, so treat it like a houseplant rather than a desert cactus: bright indirect light, water when the top inch of soil is dry, and a fast-draining mix. To get flowers every year, give it 6–8 weeks of long nights (14+ hours of darkness) and cool 55–65°F nights starting in late September — that, not fertilizer, is what triggers buds.

Most plants sold as "Christmas cactus" in US stores are actually Thanksgiving cactus. Care is nearly identical; only the bloom timing and stem shape differ.

Christmas cactus at a glance

Which holiday cactus do you have?

Iowa State Extension separates the three holiday cacti by their flattened stem segments:

Other tells: Thanksgiving cactus flowers have yellow pollen and the plant grows more upright; Christmas cactus pollen is purplish-brown and stems hang more. Commercial growers favor Thanksgiving cactus because it's easier to time for November sales.

Light

These are epiphytes from Brazilian coastal mountain forests, growing in tree forks under a canopy. At home that translates to:

• An east window, or a few feet back from a south or west window.
• Bright light without hours of hot afternoon sun, which turns segments red and bleached.
• Summer outdoors is fine in bright shade.

Too little light means few flowers and long, floppy stems. See light basics.

Watering

Unlike desert cacti, holiday cacti don't want to dry out completely for long.

1. Check the top inch of soil. Water when it's dry.
2. Water until it drains, then empty the saucer.
3. A 6-inch pot at room temperature usually needs water every 7–10 days.

Seasonal adjustments, following Iowa State:

• Bud set and bloom (fall–winter): keep the soil evenly moist. Dryness now drops buds.
• After flowering (4–6 weeks): water less; let the mix dry more. This rest builds next year's flowering.
• Spring–summer growth: regular watering and feeding.

Overwatering is the main killer, causing root rot and limp growth. More on reading soil in our watering guide.

Temperature

Comfortable at 65–70°F during the day. Cool nights matter in fall: Iowa State gives 60–65°F nights as the range that triggers flowering, and notes flowering stalls above 70°F. Illinois Extension similarly says holiday cacti seldom flower well above 70°F and that a cool night temperature of about 60°F is essential. Once in bloom, temperatures above 75°F shorten flower life and cause bud drop.

Getting it to rebloom

This is the step most owners miss. Schlumbergera sets buds in response to long nights and cool temperatures.

Starting in late September or early October, for 6–8 weeks:

1. Give 14–16 hours of uninterrupted darkness every night (Iowa State). An unused bedroom works. So does a closet from about 6 p.m. to 8 a.m., or simply a room where nobody turns on the lights after sunset.
2. Keep nights at 55–65°F. A cool porch (above 50°F), a basement window or a spare room with the vent closed all work.
3. Give bright light during the day.
4. Stop fertilizing and water slightly less until buds show.
5. Once buds are the size of a grain of rice, move it to where you want it to bloom — and don't move it again.

Even a short burst of lamp light during the dark period can reset the clock. Street lights through a window count too. More on general bloom problems in not blooming.

Bud drop

Buds falling just before they open is the most common complaint. Iowa State lists the causes: moving the plant during bud development, excessive watering, soil dryness, drafts, or artificial light at night. Add high temperatures and very dry heater air.

Prevention:

• Choose its blooming spot before buds form.
• Keep it away from heat registers, fireplaces, TVs and exterior doors.
• Keep the room below 70°F if you can.
• Keep watering steady while buds develop.
• Don't repot or fertilize heavily while it's in bud.

Soil and repotting

Use a light, slightly acidic, fast-draining mix: about half quality potting mix, 30% perlite and 20% orchid bark. Heavy, wet soils lead to rot. Holiday cacti bloom best a bit root-bound; repot every 2–3 years in spring after flowering, into a pot only 1 inch wider. Terracotta helps prevent overwatering. See repotting and potting soil.

Fertilizer

Feed from spring to late summer every 2–4 weeks with a balanced houseplant fertilizer at half strength. Stop in late August or September so the plant can settle into bud set. Many growers add a pinch of Epsom salt (1 teaspoon per gallon) once a month in summer, since Schlumbergera uses more magnesium than many houseplants. See fertilizer.

Pruning and shaping

In late spring, a few weeks after blooming, twist off 1–3 segments from the end of each stem. Each tip branches into two or more, giving a fuller plant and more flower tips next season. Use the removed pieces as cuttings.

Propagation

Iowa State's method:

1. Twist off a piece of 2–5 segments at a joint.
2. Let the cut end dry and callus overnight.
3. Insert about 1 inch deep into moist perlite, sand or cactus mix.
4. Keep bright and barely moist. Roots form in 6–8 weeks; pot up when roots are an inch long.

Putting 3–5 cuttings in one small pot gives a full plant faster. See propagation.

Pests

Mostly trouble-free. Mealybugs hide at segment joints, and scale sometimes appears as small bumps that flake off. Fungus gnats over wet soil mean you're watering too often; see our sister site's fungus gnat guide.

Toxicity

The ASPCA lists Christmas cactus (Schlumbergera bridgesii) as non-toxic to dogs, cats and horses, making it one of the best holiday plants for pet homes. Large amounts of any plant can cause mild stomach upset; call your vet if vomiting continues. Compare with poinsettia, which is mildly toxic, in our pet-safe plants list.

Buying a holiday cactus

Store plants are usually Thanksgiving cacti forced to bloom in November. Choose one with plenty of unopened buds rather than full bloom, firm green segments and no soft, dark areas where the stems meet the soil. On a cold day, have it wrapped for the trip — a chill on the way home is a classic cause of bud drop a few days later. At home, give it its blooming spot immediately and leave it there.

Common mistakes

Summer care in more detail

From June to August the plant is building the stems that will carry next winter's flowers. Water whenever the top inch dries, feed every 2–4 weeks, and give bright light without hot afternoon sun. A shaded porch is ideal once nights stay above 50°F. Long, healthy summer growth means more stem tips — and every tip is a potential flower bud.

Very old plants

Holiday cacti can live for decades, and old plants develop woody, bark-covered bases. That's normal. If an old plant declines, check the roots: decades-old mix breaks down into a dense, wet mass. Repot into fresh, airy mix, and root a few healthy tips as backup. If the base is soft and dark, the cuttings become the plant.

Can it bloom twice a year?

Sometimes. Thanksgiving cacti in particular may throw a smaller second flush in late winter or spring if nights stay cool and long. You can't force a second full bloom easily, but giving the plant a rest after the main flowering and good summer growth sets it up for the strongest display next fall.

Yearly calendar

With this rhythm a holiday cactus blooms reliably for decades — many US families have plants older than their owners. For more winter bloomers see flowering houseplants.