Plant Care Instructions*
Temperatures averaging 50°F/10°C - 75°F/23.8°C are ideal but not below 40°F/5°C and avoid frost.
Plenty of sunshine will keep cacti more than happy. In a glass room you may have to provide some shade during a hot summers day to prevent sunburn.
From Spring until Fall, water when the soil begins drying. Before and during Winter, barely water the plant. Overwatering, especially when the temperature becomes cold, can rot cacti.
A pot mixture used for cactus plants that drains well will suffice. Adding gravel or small pebbles at the bottom first few inches of the pot will encourage drainage.
Feed every 4 weeks with a high potassium fertilizer during summer.
When they are young and growing, it's best to re-pot these once a year; during Spring in a slightly bigger container. Once they mature re-pot maybe every 2 - 3 years or when necessary.
Humidity does not seem to be a major concern, which makes the average indoor environment fine, as it is. Provide as much fresh air as you can, but not cold drafts.
* Standard care recommendations - you may need to adjust based on your home or office environment.
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