Why is the bottom of my cactus turning brown?

Answer

If water does not evaporate from the soil around the base of a cactus, the plant can develop a dry sort of rot. Some cacti also develop brown dry spots (called corking) along their columns over the years. Be sure that the soil is truly dry when you do water. Also place stones and gritty sand grains and pebbles on soil to help separate the stem from the damp soil.

In the fall and winter, desert cacti experience a non-active growth period and it is important to adjust your care to preserve the health of your cactus. Water less frequently and always before noon so that all the water can be absorbed or evaporate during daylight. Water only enough to keep the plant from shriveling and err on the side of too little water.

Cacti prefer a nutrient-rich, rocky soil with excellent drainage and must be in a pot with a drain hole. Many commercial cacti and potting soil mixes rely too heavily on peat which holds moisture in the soil longer than is desirable. A proper cactus soil should drain in less than a minute after watering. Like other succulents, cacti need soil to dry out between waterings or their delicate roots will rot.

Find more information on caring for your cactus houseplant in our guide Cacti Indoors.

For tips on a variety of gardening topics, see our Plant Information Guides.
- Courtesy of NYBG Plant Information Service

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  • Last Updated Jan 19, 2021
  • Views 18560
  • Answered By Anita Finkle

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