Astrophytum asteria 'Sand Dollar'

Astrophytum asterias, known as the star cactus or sand dollar cactus, is a highly sought-after collector’s showpiece that brings instant impact to any cactus display. Its flawless, spineless symmetry, broad sculpted ribs, woolly white areoles, and delicate flecking create an unforgettable geometric pattern from every angle. Compact and exceptionally slow growing, this living work of art is ideal for premium decorative pots, sunny windowsills, small spaces, and carefully curated collections. Mature specimens can produce brilliant yellow blooms with warm orange centers—an eye-catching bonus that makes an already remarkable cactus even more desirable. With strong light, sharply draining soil, and careful watering, this rare-looking treasure offers years of distinctive beauty without taking over your space. Add one to your collection and enjoy a standout specimen that only becomes more impressive with age.

You will receive a plant similar to pictured plant.

Care Instructions

Light: Provide very bright light with several hours of direct sun each day. Morning sun or filtered afternoon sun is ideal in very hot climates. Acclimate the plant gradually when increasing light exposure to prevent sunburn, and rotate container plants periodically to maintain even, symmetrical growth.

Soil: Use an exceptionally fast-draining, mineral-based cactus mix. Amend commercial cactus soil generously with pumice, perlite, coarse sand, or fine gravel. Choose a container with an unobstructed drainage hole; a porous terracotta pot can help the mix dry efficiently.

Water: Water deeply, then allow the soil to dry completely before watering again. During active growth in warm weather, check the mix regularly but never water on a fixed schedule. Reduce watering sharply during cool or dormant periods. Keep water away from the crown and never let the pot stand in water, as this species is highly sensitive to rot.

Temperature and airflow: Keep the plant warm during active growth and protect it from frost, cold drafts, and prolonged cool, damp conditions. Good airflow is especially important in humid environments. Move outdoor container plants to a bright, sheltered location before freezing weather arrives.

Fertilizer: Feed lightly once or twice during spring and summer with a diluted, low-nitrogen cactus fertilizer. Avoid heavy feeding, which can encourage weak growth and reduce the plant’s compact form. Do not fertilize during winter dormancy or when the plant is stressed.

Flowering: Mature, well-established plants may bloom during the warmer growing season. Strong light, warmth, careful watering, and a cool, dry winter rest can support bud formation. Flowers are typically yellow with orange to reddish centers and may be followed by woolly seed-bearing fruit when pollinated.