Bleached or scorched segments point to excessive direct light. Failure to set buds can follow artificial light at night or an unsuitable seasonal day-length and temperature pattern. A limp plant needs a separate water and root check.
Best light for a Christmas cactus
Give a Christmas cactus bright, indirect or filtered light. Its flat segments can scorch in strong direct sun, unlike a desert cactus.
Plant coveredSchlumbergera spp.Christmas cactus · indoor container
Check the light reaching the leaves
Best position and light
Give Schlumbergera bright, indirect or filtered light. These tropical rainforest cacti have flat succulent stem segments, and strong direct sun can scorch them.
Use an east-facing windowsill or another bright, sheltered indoor position as a starting point. Keep the plant away from hot direct sun, radiators and sudden drafts. A warm, shady outdoor position can work in summer after acclimation, before the plant returns indoors for cold weather.
Recheck the same position through the year
Seasonal light changes
In early fall, consistent shorter days and uninterrupted darkness help initiate winter buds. During growth and flowering, return the plant to its normal bright indirect position instead of leaving it in deep shade.
Inspect the plant before moving it
Signs the light may be wrong
Some light thresholds remain unknown
Limits of this light guide
Sources
- Royal Botanic Gardens, Kew: Plants of the World OnlineTaxonomy; accepted genus
- Royal Horticultural SocietyQuick facts; location; encourage flowering
- Royal Horticultural SocietyPosition; how to grow; houseplants
- North Carolina State University Extension Gardener Plant ToolboxDescription; cultural conditions; flowering
- Iowa State University Extension and OutreachGrowing holiday cacti; flowering