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. Some of them require minimal light and partial shade to do well. Remove the cactus from its pot then begin inspecting the roots. Why is my cactus turning brown? Instead of yellow, a cactus can also turn brown. However, not all cacti species thrive in the hot sun. Photographs of mold growth on the Nopal cactus, Opuntia Mill. 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. 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. ) Rinse the roots to remove the fungus and trim rotten areas. What are the causes, cures, & preventive methods for cactus … Rot is a dark brownish-black spot that will start to ooze. Other symptoms may include your cactus turning brown or black. If the soil is not dry, move the pot to an area where the cactus can get more sun. and Saguaro in the wild as well as cacti in landscaping, gardens & kept as houseplants ? Black Spots on Cactus. What kind of cactus is this? Thanks. The most common reason for this is age and is called corking. Corking happens naturally when a cactus matures. Attached Files: GEDC0747.jpg File size: 104.7 KB 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. 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 Cacti are relatively problem-free plants, often only suffering from a few sap-feeding insects. 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. 1. Corking gives the plant a woody appearance. Turning brown means that it has developed a disease called root rot, which is caused by poor drainage or excessive watering. You may be able to save the plant if you catch the disease early. I have posted a few pictures of the cactus along with a couple smaller ones that were treated the same and are doing well. It does not seem to be really soft and mushy. 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. Does a black cactus mean it is dead or will it turn green again? Fix root rot in Cactus. Check the plant for any signs of the roots rotting. Discoloration, shakiness, and mushy roots are often signs of cactus root rot. 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