Astrophytum myriostigma cv. WalnutAstrophytum myriostigma cv. Walnut is a horticultural cultivar of Astrophytum myriostigma distinguished by its unusually dark, nutbrown epidermis and dense white flecking, giving it a walnut shell appearance. Bright sun Full sun to bright indirect light; too much intense sun may scorch dark cultivars. Minimal watering Let soil dry completely; water every 710 days in summer, much less in winter. Fastdraining substrate Sandy, gritty, cactus mix; avoid

Hardy to -20F

Medium 10"x10"

Keep well-watered while blooming and cut back on watering in the winter

With lilac-blue flowers to 15 in

colorful leaves

Allow soil to dry completely between waterings

feed monthly in spring

Will tolerate morning sun but prefers shade

Small: 8″D x 7″H

rather than direct sunlight and sufficient warmth and moisture for moderate humidity

does not require regular pruning

in windowsills