Repotting Christmas cactus | Making potting soil
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Issue: January 26, 2002

Repotting Christmas cactus

Question:

I am ready to re-pot my Christmas cactus and am wondering what the proper soil is for it. Would it be best to use a potting soil such as Miracle-Gro, or would it need a more acidic soil such as that for African violets?

Answer:

ow is a good time to repot Christmas cacti (Schlumbergera spp.). Following flowering they should have begun growing, or will begin soon. The soil into which you transplant them is important, but the Christmas cactus is tolerant of various conditions. It is very important that the potting soil be well drained. This is one of the plants that will not tolerate soggy conditions - it needs air around its roots. Having said that, I have seen Christmas cacti growing very well in garden soil used as potting soil. The ideal potting soil will contain a high proportion of organic matter such as peat or well-decomposed compost. Addition of coarse sand, or even aquarium gravel, will provide the necessary drainage and aeration. There are commercially available cactus potting soils that are designed to be well-drained soils. The reason for such a need for aeration is that these plants are native to tropical rain-forests where they grow as epiphytes high in the trees. The "soil" in these locations is just composted tree leaves and whatever else gets caught in this "compost pile." There is a distinct dry season, but even in the wet season when it rains daily, the location of these plants high in the trees causes drying of the compost around the roots each day. Roots in a pot will not dry as completely, but a well-drained potting soil allows adequate aeration for healthy root growth.

Making potting soil

Question:

Can I make my own potting soil by taking soil from the garden?

Answer:

Garden soil works best in the garden but can be used in potting soil. In the confined environment of a pot, addition of certain amendments is helpful. Compost, peat, or other organic matter is a good addition to garden soil. If the garden soil is quite sandy, organic matter may be all that is required. If the garden soil has a lot of clay, perhaps some coarser material such as coarse sand or aquarium gravel should be added, depending on the plants to be grown. Another consideration is the presence of fungi and bacteria in all garden soils. In the confined environment of a pot, these are more likely to damage plants. You can pasteurize the soil by heating it to a temperature of 160 degrees for 30 minutes. Heated soil does not smell good, so if you can pasteurize the soil outside, it is advisable. You can use a portable oven or barbecue for outdoor soil pasteurization.

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Also, please join us on Southwest Yard & Garden, a weekly program made for gardeners in the Southwest. It airs on KRWG in Las Cruces Saturdays at 11:30 a.m., repeating Thursdays at 1:00 p.m.; on KENW in Portales on Saturdays at 10:00 a.m.; and on KNME in Albuquerque on Saturdays at 9:30 a.m.

Send your gardening questions to Yard and Garden, ATTN: Dr. Curtis Smith NMSU Cooperative Extension Service 9301 Indian School Road, NE, Suite 112 Albuquerque, NM 87112

Curtis W. Smith, Ph.D., is an Extension Horticulture Specialist with New Mexico State University's Cooperative Extension Service. New Mexico State University is an equal opportunity/affirmative action employer and educator.

Please join us on Southwest Yard & Garden, a weekly garden program made for gardeners in the Southwest on: KNME-TV Albuquerque at 9:30 p.m. Saturdays, KENW-TV Portales at 10 a.m. Saturdays, and KRWG-TV Las Cruces at 11:30 a.m. Saturdays (repeated at 1 p.m. Thursdays.)