Rosie Lerner, Purdue Extension Consumer Horticulture Specialist
Christmas cacti are not only popular holiday gift plants,
but they are also the subject of frequent debate among gardeners. There appears
to be much confusion about these unique tropical cacti regarding care,
maintenance and, especially, on how to get them to re-bloom. The following tips
address the most frequently asked questions.
We typically think of cacti as being heat tolerant, but
Christmas cacti will keep their blossoms longer in cooler temperatures. Keep the
plant in a well-lit location away from drafts from heat vents, fireplaces or
other sources of hot air. Drafts and temperature extremes can cause the flower
buds to drop from the plant before they have a chance to open.
Christmas cactus is a tropical type plant, not quite as
drought tolerant as its desert relatives and, in fact, may drop flower buds if
the soil gets too dry. The plants will wilt when under drought stress. Water
thoroughly when the top inch or so of soil feels dry to the touch. The length of
time between waterings will vary with the air temperature, amount of light, rate
of growth and relative humidity.
The plant does not particularly need to be fertilized
while in bloom, but most gardeners enjoy the challenge of keeping the plant
after the holidays for re-bloom the next year. While plants are actively
growing, use a blooming houseplant-type fertilizer and follow the label
directions for how much and how often to feed.
While the Christmas cactus can adapt to low light, more
abundant blooms are produced on plants that have been exposed to more light
intensity. Keep your plants in a sunny location indoors. Plants can be moved
outdoors in summer, but keep them in a shady or semi-shady location. Leaves may
start to turn a bit red if exposed to excessive light. Too much direct sunlight
can actually burn the leaves or may cause them to become limp. When it's time to
bring the plants back inside in the fall, slowly adjust the plants to life
indoors by gradually increasing the number of hours they spend indoors each
day.
If your plant tends to dry out and/or wilt frequently, it
may be time to repot the plant into a slightly larger container. Well-drained
soil is a must for Christmas cactus. Use a commercially packaged potting mix for
succulent plants or mix your own by combining two parts plain potting soil with
one part clean sand or vermiculite.
Pruning your Christmas cactus after blooming will
encourage the plant to branch out. Remove a few sections of each stem by
pinching them off with your fingers or cutting with a sharp knife. These
sections can be rooted in moist vermiculite to propagate new plants.
Christmas cactus will bloom if given long uninterrupted
dark periods, about 12 hours each night. Begin the dark treatments in about
mid-October to have plants in full bloom by the holidays. You can place the
plants in a dark closet from about 8 P.M. - 8 A.M. each night for 6-8 weeks or until
you see buds forming. Christmas cacti will also bloom if they are subjected to
cool temperatures of about 50 to 55 degrees F, eliminating the need for the dark
treatments. Plants should be blooming for the holidays if cool treatments are
started by early November.
Other species of holiday cactus bloom at different times
of the year and have slightly different growth habits. Christmas cacti have
scalloped stem segments and bloom at the stem tips. Thanksgiving cacti have 2-4
pointy teeth along the edges of the sections and will bloom earlier than
Christmas cactus if left to natural day-length. Easter cacti have rounded teeth
along the segments and bloom primarily in the spring but may also periodically
re-bloom at other times of year.
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