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Q.Why is my cactus soft and flexible?

Zone St John's Newfoundland | Anonymous added on July 4, 2020 | Answered

I got my cactus a little over a month ago. I transplanted them into a terrarium and have been watering them once a week or so, or when the soil feels dry. What is causing this.

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Certified GKH Gardening Expert
Answered on July 5, 2020

That sounds like too much water for a cactus. They don't require a lot of moisture and since it is in a terrarium, the humidity is high as well. Not enough light could be a factor, too, or cool temperatures.

Here is more:

if the cactus is not a crawling variety, include over/underwatering, not enough light, too much humidity, and cold temperatures.

The most sinister would be a fungal/bacterial infection. This article will help you should this be the case: https://www.gardeningknowhow.com/ornamental/cacti-succulents/scgen/cactus-going-soft.htm

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