Staff Answer
Aug 15, 2022 - 01:20 PM
Hi Joe!
Unfortunately, there's a lot of reasons why a cactus might start developing blackened areas, with overwatering being the most common by far. It's important to note that if the soil is too rich, even minuscule amounts of water can remain in the soil and cause rot.
Aside from rot though, fertilizer burn is another classic reason for black spots. Have you fertilized recently?
You can read our article on black spots and that may help you narrow down what the issue is. If not, you can always send us a couple clear pictures of the problem cactus via email at info@mountaincrestgardens.com and we'll do our best to diagnose it. If you do that, be sure to include the following information:
1) Growing conditions (full sun, part sun, filtered sun, indoors, outdoors, etc.)
2) Soil used for planting
3) Watering schedule
4) Does the container have a hole for drainage?
Unfortunately, there's a lot of reasons why a cactus might start developing blackened areas, with overwatering being the most common by far. It's important to note that if the soil is too rich, even minuscule amounts of water can remain in the soil and cause rot.
Aside from rot though, fertilizer burn is another classic reason for black spots. Have you fertilized recently?
You can read our article on black spots and that may help you narrow down what the issue is. If not, you can always send us a couple clear pictures of the problem cactus via email at info@mountaincrestgardens.com and we'll do our best to diagnose it. If you do that, be sure to include the following information:
1) Growing conditions (full sun, part sun, filtered sun, indoors, outdoors, etc.)
2) Soil used for planting
3) Watering schedule
4) Does the container have a hole for drainage?
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