If the soil is not dry, move the pot to an area where the cactus can get more sun. Rinse the roots to remove the fungus and trim rotten areas. This may sound abnormal because most of us tend to think that cacti plants are sun-loving, desert plants. Remove the cactus from its pot. Cactus turning black Huge pimple turned black Download Here Free HealthCareMagic App to Ask a Doctor. Corking gives the plant a woody appearance. Rot is a dark brownish-black spot that will start to ooze. It does not seem to be really soft and mushy. Why is my cactus turning brown? If the cactus is turning yellow or brown, it is getting too much sunlight and you should move it into a spot with better shade. Some of them require minimal light and partial shade to do well. The disease, which causes the plants to wilt and eventually die, is identified by a wilted appearance and soggy, black or reddish brown roots. What kind of cactus is this? Cacti really don’t like to be watered very often, of course this depends on the specific cactus you have but in general these are pretty drought resistant plants. Cacti are relatively problem-free plants, often only suffering from a few sap-feeding insects. First Step is to Identify that your cactus has rot. Rot is caused by the skin of the cactus getting punctured some how, some ways are: An insect or animal biting the plant Debris in a monsoon storm hitting the plant Someone purposely poking the plant Another plant growing into the plant Attached Files: GEDC0747.jpg File size: 104.7 KB Other symptoms may include your cactus turning brown or black. Does a black cactus mean it is dead or will it turn green again? What are the causes, cures, & preventive methods for cactus … What genera/species of mold commonly grow on or injure cactus plants (family Cactaceae) such as the Mexican Nopal or prickly pear cactus (photo at left, - Opuntia Mill. ) If your cactus plant is turning brown from the top, the most common and likely cause would be sunburn. Fix root rot in Cactus. Check the plant for any signs of the roots rotting. You may be able to save the plant if you catch the disease early. Turning brown means that it has developed a disease called root rot, which is caused by poor drainage or excessive watering. All the information, content and live chat provided on the site is intended to be for informational purposes only, and not a substitute for professional or medical advice. Corking happens naturally when a cactus matures. Black Spots on Cactus. The most common reason for this is age and is called corking. 1. However, not all cacti species thrive in the hot sun. It occurs from the base of the plant where it touches the soil and can move up slowly or can stay in one spot. Thanks. Photographs of mold growth on the Nopal cactus, Opuntia Mill. Remove the cactus from its pot then begin inspecting the roots. Cut away any brown or black parts of the cactus to prevent rot from spreading. And here’s why root rots are common in cacti plants: Cacti have a wide, shallow root system to maximize water collection in their natural habitat. and Saguaro in the wild as well as cacti in landscaping, gardens & kept as houseplants ? Instead of yellow, a cactus can also turn brown. Discoloration, shakiness, and mushy roots are often signs of cactus root rot. I have posted a few pictures of the cactus along with a couple smaller ones that were treated the same and are doing well. Another common cause of a cactus turning black can be attributed root rot which can be caused by overwatering, poor draining soil or a combination of both. 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