Indoor Plant Care Care instructions for indoor cacti and succulents. Water cacti and succulents thoroughly when soil is completely dry. When in doubt, don't water. These plants are greenhouse grown. Place in as high light as possible, but not in full sun until they have a chance to acclimate. Cacti and succulents rest when the night time temperatures go below 50 degrees. Maintain light, but reduce water and fertilizer during these months.

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