I Transplanted Several Golden Barrel Cactuses And 2 Months Later They Are Discoloring (brown) From The Base Up

Question

They were purchased from a nursery in the Palm Springs area and re-planted in the central san joaquin valley in calif. It’s been rather cold at night. We’ve received a good amount of rain during the 2 months they’ve been in the ground. Should I fertilize, dig up and re-pot and keep in a warmer environment? How might I determine if rot rot is taking place? Thank you

Answer 1

Is the soil well draining? If it isn't and you received a lot of rain there could be root rot setting in. The only way to tell for sure is to examine the roots. Check the lower portion for soft spots and decay. Since the article below says it develops yellowing at the base and yours is brown, it could be related to the cool weather. They are hardy to zone 9, which you are in, but if the cacti are small, they are more susceptible to freezing temps. If a frost is predicted, be sure to cover them if they are not a mature size.

Barrel cacti also should not be planted too deeply. You may want to raise it up on a berm to increase warmth and improve drainage. Golden barrel cactus does not need fertilizer.

https://www.gardeningknowhow.com/ornamental/cacti-succulents/barrel-cactus/golden-barrel-cactus-care.htm

https://www.gardeningknowhow.com/ornamental/cacti-succulents/barrel-cactus/pythium-rot-in-barrel-cactus.htm