Help Southwest succulents and cacti thrive this winter: water sparingly, protect from rain and frost, and provide light for a healthy spring.
Succulents and cacti have become favorites in Southwest gardens thanks to their resilience, adaptability, and low water needs. However, winter brings unique challenges to these plants, particularly with the combination of seasonal rains and occasional frost. Here’s how to help your succulents and cacti thrive through the Southwest’s cooler months and emerge healthy in the spring.
As temperatures drop, succulents require significantly less water. Overwatering during winter is one of the most common causes of rot and fungal problems, as their root systems become especially sensitive to excess moisture in cool conditions. Water only when the soil is completely dry—usually every three to four weeks in winter. If your succulents are in pots, ensure they have adequate drainage, as standing water around the roots can lead to root rot.
Winter rains can be surprisingly intense in parts of the Southwest, leaving these plants vulnerable to prolonged moisture. If your container succulents are outdoors, consider moving them under a covered area, such as a porch or awning, where they’ll still receive light but avoid the rain. If relocating them isn’t practical, place a tarp or plastic cover over them during rainstorms, but make sure there’s room for air circulation to prevent trapped humidity, which can lead to rot or fungal issues.
Some regions in the Southwest, especially at higher elevations, experience frost. Frost can cause significant damage to succulents and cacti, particularly more sensitive varieties. On cold nights, cover them with frost cloths, old bedsheets, or lightweight blankets, taking care to avoid direct contact with the plants. In areas with consistently cold temperatures, you might consider moving them indoors or placing them in a greenhouse for added protection.
Though pests are less active in winter, common ones like mealybugs can still appear. Regularly inspect your succulents and cacti, especially around the base and under leaves. Treat any pests you find with insecticidal soap or dab them with rubbing alcohol on a cotton swab.
Succulents can usually tolerate lower light levels in winter, but indoor succulents may need extra brightness. Place them near a sunny window or consider using supplemental grow lights to keep them vibrant. By following these guidelines, your succulents and cacti will be well-prepared to handle the Southwest’s winter conditions and flourish in the warmer months ahead.
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About The Author
John Bagnasco has been in the gardening industry for over 50 years, starting with a horticulture degree from Michigan State University and following a stint at Frank’s Nursery and Crafts in Detroit.
After publishing his first book “Plants for the Home Vol. I” in 1976, he moved to California to become regional manager and buyer for the Nurseryland division of Sunbelt Nursery Group.
He then became the head buyer for Armstrong Garden Centers based in Glendora, California. John had a part-time affiliation with Creative Promotions for ten years before joining them full-time in October 2000 as a senior editor and radio personality for Garden Compass.
John has also taught horticulture classes at Palomar College and San Diego State University.
He is the host of the DVD “The Essential Guide to Roses,” which also features Bryan Main and Bruce and Sharon Asakawa.
His most recent book is “Planting Designs for Cacti and Succulents”.
Currently, John is a co-host on “Garden America,” an interactive live gardening show that additionally provides podcasts of the broadcasts accessible on all major platforms.
You can contact John here.