How to Water Christmas Cactus
Schlumbergera spp.
Reviewed by Kiersten Rankel M.S.
Quick Answer
Water your Schlumbergera every 10–14 days from late winter through summer, when the top inch of soil is dry. Stretch to every 18–21 days in fall to encourage bud set.
Schlumbergera looks like a cactus but is a tropical jungle plant from Brazilian rainforests. Soak deeply and never let it go bone-dry.
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How Often and How Much to Water
Adjust the sliders below for your pot size, light, and setting. The numbers assume a light well-draining mix with peat-free organic matter and perlite, and a pot with drainage.
Setting
Every
9days
Use
1cup
Your Watering Rhythm Across the Year
Soil dries faster in the growing season, which varies by region. Slow down watering in the off-season to avoid overwatering.
Pacific
Mountain
Midwest
Northeast
Southeast
JFMAMJJASOND
Growing season
Growing season
9days
Resting season
3–4weeks
How to Water Your Assorted Schlumbergera
Soak the soil, drain fully. Schlumbergera roots want a complete drink and then a chance for the top inch to dry before the next watering.
1
Pour room-temperature water at the soil line, around the base of the segments.
2
Soak slowly until water runs out the drainage holes. That tells you the rootball is fully wet.
3
Empty the saucer after 10 minutes so the roots aren't sitting in standing water.
Should You Water Your Assorted Schlumbergera Today?
Always check the soil before you pour. Schlumbergera tolerates a brief dry stretch better than soggy roots, but it is far less drought-tolerant than a desert cactus.
Hold off
Top inch of soil still feels damp
Segments look firm and plump
Stems held outward and full
Buds or flowers look firm and tight
Pot feels heavy when you lift it
Ready for water
Top inch of soil dry to the touch
Segments looking thin or slightly wrinkled
Stems softening and drooping
Visible gap between soil and pot wall
Pot feels light when lifted
If Something Looks Off
Underwater and overwater both leave Schlumbergera looking limp and sad. The soil moisture and the segment texture tell them apart.
Underwatered
Soil
Bone-dry through the pot and pulled away from the sides
Leaves
Segments turn thin and wrinkled with shallow ridges along the edges
Pace
Slow decline that plumps back up within a day or two of a soak
Next steps
Set the pot in a basin of room-temperature water for 20 minutes
Drain fully and return to its usual bright indirect spot
Expect segments to plump back up over 24 to 48 hours
Any segments that turned brown and crispy won't recover but green segments will firm back up
Overwatered
Soil
Stays dark and damp for over a week with a sour smell. You may also see fungus gnats hovering above the soil
Stem
Soft and browning at the soil line
Leaves
Segments turn translucent and limp from the base outward
Pace
Sudden collapse that worsens even after you stop watering
Next steps
Stop watering immediately and move to a bright airy spot
Pop out of the pot and trim any dark mushy roots back to firm white tissue
Repot in fresh light well-draining mix in a clean pot with drainage
Wait until the top 2 inches of soil are dry before the first watering
Remove any segments that have turned brown or translucent at the base
Got More Questions?
Why isn't my Schlumbergera blooming?
Bud set requires cool nights between 50 and 60F and 12 to 14 hours of uninterrupted darkness for about 6 weeks in fall. The plant must also be slightly dry, watering only every 18 to 21 days during that window.
Indoor lamps that turn on at night break the dark cycle and stop bud set. Move the plant to a cool spare room or unheated porch from late September through early November and your blooms will come.
Should I water my Schlumbergera while it is blooming?
Yes, slightly more often than during the rest set. Buds and flowers pull water through the plant and a dry rootball during bloom causes bud drop.
Check the top inch every few days during flowering. As soon as it goes dry, water until it runs out the bottom. The flowers can last 4 to 6 weeks if the soil moisture stays steady.
Why are the segments dropping off my Schlumbergera?
Sudden segment drop usually means root stress, almost always from overwatering. Healthy plants do shed an occasional weak segment but losing several at once is a warning.
Check the soil. If it has been damp for over a week, hold off and let it dry to the second inch. If you can wiggle the plant in the pot, the roots have rotted and you need to repot in fresh dry mix.
Is tap water OK for Schlumbergera?
Yes. Schlumbergera tolerates average tap water without trouble. Lukewarm or room-temperature water is gentler than cold straight from the tap, especially in winter.
How long can my Schlumbergera go without water if I'm on vacation?
An established Schlumbergera in a 5 to 6 inch pot handles 3 weeks easily and longer in winter. Deep-soak it and move out of harsh sun before you leave.
During active bloom, ask a neighbor to check the soil at the 2 week mark so the flowers don't drop early.
Are self-watering pots a good idea for Schlumbergera?
Not recommended. Schlumbergera looks like it would love constant moisture but its roots actually need oxygen between waterings. Constant wet leads to crown rot.
A standard pot with drainage and a saucer you empty is the safest setup.
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About This Article
Kiersten Rankel M.S.
Botanical Data Lead at Greg · Plant Scientist
Editorial Process
Watering guidance verified against Schlumbergera spp. growth data from Greg's botanical database, cross-referenced with USDA hardiness zone data and published horticultural research.
1+ Greg users growing this plant
USDA hardiness zones 9a–12b