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Information About the Christmas Cactus
Christmas cactus (Schlumbergera bridgesii) is a popular, winter-flowering houseplant native to Brazil, available in a wide variety of colors including red, purple,
oranges, pinks and creams. Its pendulous stems make it a great choice for hanging baskets.
Christmas cactus is a member of a group sold as holiday cacti that includes the Thanksgiving cactus (Schlumbergera truncata) and the Easter cactus (Rhipsalidopsis
gaertneri). When grown under normal nightlength conditions, Thanksgiving cacti normally flower near Thanksgiving approximately a month before Christmas cacti. The
Easter cactus flowers primarily in the spring and sporadically throughout the year. All of the holiday cacti have similar cultural requirements.
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LIGHT AND TEMPERATURE:
The Christmas cactus grows best in light shade. Full sunlight is beneficial in midwinter, but bright sun during the summer months can make
plants look pale and yellow. Ideal growth occurs at temperatures between 70 to 80 °F during its growing season from April to September. Do not let temperatures rise
above 90 °F once the flower buds are set in the fall. Continuous warm temperatures can cause flower buds to drop.
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WATERING AND FERTILIZER:
Water the growing medium when it is dry to the touch. The Christmas cactus is tolerant of dry, slightly under-watered conditions. Do not let
the soil become waterlogged, especially during the dark days of winter. Do not let the soil dry out either. Reduce watering from fall through spring. Fertilize plants
monthly from the time new growth starts in late winter or early spring, and throughout the summer using a one-quarter strength soluble fertilizer. Reduce fertilizer during
the fall and early winter.
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GROWING MEDIA:
The Christmas cactus flowers best when kept somewhat potbound. Repotting is necessary only about once in
three years. The potting
media must be well-drained with good aeration, because the Christmas cactus does
not grow well in heavy, wet mixes. A good mix may
contain one part potting soil, two parts peat moss or compost, and one part sharp sand or perlite.
PROBLEMS:
The Christmas cacti commonly drops unopened flower buds, which may be induced by an excessive number
of buds or a sudden change
in temperature, light or other environmental factors, such as drying out of the growing medium. Lack of flowering is often due to light
interrupting the long night period (12 hours) that is required for
flowering initiation to occur. Street lights, car lights or indoor lighting can
disrupt the required dark period. The major disease is root rot, which can be prevented by
avoiding excessive watering. Insects and related pests include mealybugs, soft brown scale, red spider mites and aphids.
Prepared by Nancy Doubrava, HGIC Information Specialist and Al Pertuit, Extension Floriculture Specialist, Clemson University.
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The above information is from Clemson Extension
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