Cacti should generally be watered every 1 to 2 weeks during their active growing season in spring and summer, allowing the soil to dry out completely between waterings. In the dormant season of fall and winter, watering should be reduced to about once every 4 to 6 weeks, with the soil kept almost completely dry. The exact frequency depends on factors such as the cactus species, climate, humidity, pot size, and whether the cactus is indoors or outdoors. Indoor cacti typically need less frequent watering than outdoor ones due to more stable temperatures and lower sunlight exposure. It's best to water deeply but infrequently, ensuring good drainage to avoid root rot. Using a soil moisture meter or checking the soil dryness before watering is recommended for the healthiest cactus care. Summary of key watering guidelines:
- Spring/Summer (growing season): water every 1-2 weeks, soil dry before watering.
- Fall/Winter (dormant season): water every 4-6 weeks, soil mostly dry.
- Indoor cacti: generally less frequent watering.
- Outdoor cacti: may need more frequent watering during hot, dry weather.
- Use well-draining soil and pots with drainage holes.
- Avoid overwatering to prevent root rot.
These recommendations help maintain healthy cactus growth by mimicking their natural arid environment while meeting their moisture needs.