How often to water cactus?
Water most desert cacti every 2-4 weeks during their active growing season (spring and summer) when the soil is completely dry, and reduce to once every 4-8 weeks or cease entirely during dormancy in fall and winter. For tropical cacti like Christmas or Easter cactus, water every 1-2 weeks during active growth, allowing only the top inch of soil to dry out between waterings.
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