Basic Indoor Cactus Care: Water, Light, and Common Mistakes

Large indoor cactus care fundamentals: water when dry, bright light, no direct sun, and avoid the "teaspoon a month" myth.

Watering Protocol

• Test: Wooden skewer to bottom—dry = water
• Method: Soak until drains freely
• Frequency: Summer 2-3 weeks; Winter 4-6 weeks
• Signs of thirst: Slight shriveling, spine gap widening

Light Requirements

• Ideal: South/west window, 4-6 hrs direct sun
• Acclimate: 1 hr → add 30 min weekly
• Supplement: LED grow light if <4 hrs sun
• Rotate: Weekly for even growth

Common Mistakes

Seasonal Adjustments

• Spring: Increase water; begin fertilizing
• Summer: Peak water/light; watch for pests
• Fall: Reduce water; stop fertilizer
• Winter: Minimal water; cool temps if possible

Large cacti are resilient if basics are right. The "indoor" label doesn't change their desert biology.