Cacti are hardy plants that require very little water or maintenance to survive, but they do still need some specialized care. Both indoor and outdoor cacti can suffer from leaning. A cactus that has been growing upright but is now leaning indicate that your plant is stressed in some way. Careful observations can help determine why the plant is leaning. If a problem is detected early, solutions are available that will save the cactus.
Even if your cactus is planted in full sun, it may lean. Plants naturally grow toward the sunlight. If the cactus is otherwise healthy, this is not a danger. However, if a cactus planted in partial shade is leaning, it may need more sunlight. A cactus in this condition will look sickly and have weak, flimsy stems that are yellow-green. The plant should gradually be exposed to stronger sunlight to prevent sunburn.
If the cactus is leaning from the ground, it may be loosely planted in the soil. Improper watering may be the reason. After watering a cactus, the soil must be allowed to dry out before watering again. Watering too frequently prevents the soil from hardening around the base of the cactus and causes the soil to loosen. Provided there is no root rot, either transplanting the cactus in dry soil or packing more dirt around it is a solution. Also, adding a layer of small rocks or gravel on the surface can stabilize the cactus.
Rot is caused by fungi and bacteria growing on the plant. The most common reason for rot is watering the cactus too often. The infected spot will have a watery, slimy, black appearance. Rot begins at the base of the cactus and works its way to the top. Rotting plants start to lean, then collapse and die. If rot is detected early, dig up the cactus and replant it in dry soil. Otherwise, remove the cactus from the soil, and cut the healthy top away from the diseased part. Allow the top to dry and dust the cut surface with a fungicide before replanting it in sandy soil.
Insects eating the stem of the cactus can weaken the plant and cause it to lean. A cactus infested with mealybugs will stop growing and take on a sickly, deformed appearance. Mealybugs should be removed with tweezers, or a cotton swab dipped in alcohol. Ants nesting at the base of the cactus eat away at the stem, causing it to lean and eventually fall over. Wash away the ants with a strong, lukewarm stream of water. A cactus weakened by insects may develop fungi and rot and will die if not treated.
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