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Winter Watering for Indoor Cacti Under Lights: Sulcorebutia & Neochilenia

Two Rare Cacti Under 12-Hour Lights: Watering Frequency?

A grower has Sulcorebutia rauschii (non-grafted) and Neochilenia occulta (grafted) under lights 12 hrs/day. Currently watering every 2 weeks when dry. Asks if this is correct for winter.

Greg's Adjustment: Less Water, Allow Dormancy

Water thoroughly, then let dry completely.
Winter: every 3–4 weeks is sufficient.
Neochilenia occulta is rot-prone—err on the drier side.
Allow plants to go dormant; don't force growth with frequent watering.

Helpful Resources

Cool, dry winter rest ensures better spring growth and flowering.

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