Light: Thimble cactus will grow in full sunlight or light shade. If you grow thimble cactus in full sunlight, be careful about moving it to a shady spot too suddenly, as the cactus may scorch.
Water: Water thimble cactus sparingly during the summer. Throughout the winter months, water only if the cactus looks wilted.
Soil: Always allow the soil to dry between each watering. The cactus is likely to rot very quickly in soggy soil.