Description
Thimble cactus (Mammillaria gracilis) is a petite, clustering cactus covered in delicate-looking white spines. Small offsets create a rounded mound, and established plants may produce pale cream to yellowish flowers.
Growing in Alabama
Plant in a gritty, fast-draining cactus mix and place in bright light. Morning sun or a bright indoor window works well; acclimate plants slowly to stronger outdoor sun. Water only after the mix dries, and use much less water during cool, low-light months. Protect from hard freezes and prolonged winter rain.
Size: Commonly around 4–6 inches tall and wide in a container, spreading slowly through offsets. Tip: Handle gently when repotting, since the small offsets detach readily.
