Minimal; water weekly during the first year, then only during extreme droughts.
Must be extremely well-draining; gritty, sandy, or rocky soils are ideal.
Zones 4–10; it is exceptionally cold-hardy and heat-tolerant. Maintenance & Pruning
Wear sturdy gloves to remove dead or winter-burned leaves in early spring by cutting them close to the base.
Unique selections such as can be found at Plant Addicts . How to Grow and Care for Adam's Needle