Christmas Cactus
Schlumbergera spp.
Through the year 🗓️
☀️ Summer now
A shaded outdoor summer plumps the segments; feed monthly.
🍂 Fall
The trigger season: cool nights and long dark evenings set the buds. Do not move it once budded.
❄️ Winter
Bloom time! Keep it lightly moist and away from cold drafts that drop buds.
🌱 Spring
Post-bloom rest: light watering, and prune segments to shape.
The details
Light & placement
- Light
- Bright indirect; a little gentle direct sun is fine, since it is a jungle (epiphytic) cactus, not a desert one
- Ideal PPFD
- 150–350 µmol·m⁻²·s⁻¹
- Grow-light distance
- 12–20 in below LED
Water & feed
- Watering method
- Water when the top 1 in is dry: more than a desert cactus, less than a fern. Ease off after blooming and during the fall rest.
- Fertilizer
- Balanced feed at ½ strength, monthly spring–late summer; stop in fall to encourage buds.
Home & habit
- Soil
- Airy, well-draining mix (potting soil + bark/perlite); pH 5.5–6.5
- Humidity
- Average–high (50%+)
- Temperature
- 65–75 °F; cool 55–60 °F nights set buds
- Mature size
- 12–24 in, arching
- Repotting
- Every 3–4 yrs; blooms best when snug
- Propagation
- Break off a 2–3 segment piece, let it callus a day, then root in soil. Extremely easy.
When something looks wrong
- Overwatering signs
- Limp, translucent, yellowing segments; mushy base
- Underwatering signs
- Wrinkled, flattened, reddish segments
- Common pests
- Mealybugs, fungus gnats, root mealybugs
Common problems 🩺
The usual suspects when Christmas Cactus looks unhappy. Most houseplant trouble is watering or light, not disease — see all plant problems if you are not sure which plant is the culprit.
No blooms in winter
Likely cause
It needs long dark nights and cool temperatures to set buds.
What to do
From about six weeks before you want flowers, give it 12–14 hours of uninterrupted darkness and cool nights.
Dropping buds before they open
Likely cause
It was moved, or the watering changed while budding.
What to do
Once buds form, leave it exactly where it is and keep watering steady.
Limp, mushy segments
Likely cause
Overwatering — it is a jungle cactus, not a desert one, but it still rots.
What to do
Let the top inch dry between waterings and make sure the pot drains.
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