Photo: Joseph AubertCC BY 4.0via iNaturalistresized / cropped
Sand Dollar Cactus Plant Care
Astrophytum asterias (Zucc.) Lem.
Updated · Sources · How we source care data
This unique cactus species is known for its striking star-shaped rib structure, resembling a sea urchin. Originally from Mexico, the Astrophytum asterias is prized by plant collectors for its rare and eye-catching appearance, making it a standout addition to any succulent collection.
Every 14–21 days
Full sun
70–90°F
40–60%
At a glance
How do you care for Sand Dollar Cactus?
Water Sand Dollar Cactus every 14–21 days, letting the top layer of soil dry out between waterings, and give it full sun. It prefers temperatures of 70–90°F (21–32°C) and 40–60% humidity. Fertilize it every month during the growing season.
Where Is the Sand Dollar Cactus Native To?
What Is the Sand Dollar Cactus?
Sand Dollar Cactus (Astrophytum asterias) belongs to the Cactaceae family within the Astrophytum genus. Sand Dollar Cactus is native to small parts of Texas in the United States and Mexico. Sand Dollar Cactus is also known as Sea Urchin Cactus, Star Cactus.
Sand Dollar Cactus displays a low clumping cactus growth habit, reaching up to 1 ft tall with a spread of approximately 1 ft. Sand Dollar Cactus produces yellow flowers with red centers.
Leaf size: approximately 4 inches.
How Often Should You Water a Sand Dollar Cactus?
Astrophytum asterias requires watering every 14–21 days. Allow the top layer of soil to dry between waterings to prevent root rot. Reduce watering frequency during winter when growth slows.
Watering Frequency
Every 14–21 days
Let soil partially dry between waterings
What Light Does the Sand Dollar Cactus Need?
Sand Dollar Cactus thrives in full sun.
Light Requirement
Full sun
What Temperature and Humidity Does the Sand Dollar Cactus Prefer?
Astrophytum asterias grows best at temperatures of 70–90°F. Sand Dollar Cactus prefers humidity levels of 40–60%.
Temperature
70–90°F
Humidity
40–60%
What Soil Mix Works Best for a Sand Dollar Cactus?
Sandy, well-draining cactus mix with perlite and coarse sand. Good drainage is essential for Sand Dollar Cactus to prevent waterlogging, which leads to root rot and fungal issues.
How Often Should You Fertilize a Sand Dollar Cactus?
Feed Sand Dollar Cactus every month during the growing season (spring and summer) with a balanced fertilizer diluted to the strength on the label.
Pause feeding in autumn and winter, when growth slows, and never fertilize dry soil — water first.
Fertilizing
Every month
During the growing season
The PlantoScan app can remind you when to water and when to fertilize each plant.
How Do You Repot a Sand Dollar Cactus?
Repot every 2-3 years in early spring. Choose a pot one size larger than the current container, and ensure it has drainage holes to allow excess water to escape.
How Do You Propagate a Sand Dollar Cactus?
Sand Dollar Cactus can be propagated through seeds, offsets. Similar propagation techniques also apply to goat horn cactus plant care, which shares the same genus.
Is the Sand Dollar Cactus Toxic to Pets and Children?
Pet safety not verified
The ASPCA does not list Sand Dollar Cactus, so we can't confirm whether it is safe for cats and dogs. Keep pets from chewing it as a precaution.
This is a general caution, not veterinary or medical advice. If your pet ate a plant, contact your vet or animal poison control.
See all plants toxic to cats and plants toxic to dogs.
What Pests and Diseases Affect the Sand Dollar Cactus?
Sand Dollar Cactus is susceptible to mealybugs, spider mites. Inspect the foliage regularly, especially along leaf undersides and stems. Treat infestations promptly with insecticidal soap or neem oil to prevent spread.
Yellow leaves, brown tips or drooping? See common plant problems and how to fix them.
What USDA Hardiness Zone Does the Sand Dollar Cactus Need?
Sand Dollar Cactus grows outdoors in USDA Zone 10b – 12b. It survives winters down to planting zone 10b. Sand Dollar Cactus is native to small parts of Texas in the United States and Mexico. In cooler regions, grow Sand Dollar Cactus as a houseplant or bring it indoors before the first frost.
Hardiness Zone
Zone 10b – 12b
Keep exploring plants
Sand Dollar Cactus is one of many species covered in the complete plant care and identification guide, which groups plants by genus, attribute, and popularity.
It belongs to the Astrophytum genus — compare its care with other Astrophytum species on PlantoScan.
Astrophytum is part of the Cactaceae plant family — browse all Cactaceae genera and species.
Sand Dollar Cactus thrives in bright light and direct sun — see other bright-light plants.
Related Plant Care Guides
Closely related plants with similar care requirements:
Sources
- Scientific name & taxonomy: Astrophytum asterias (Zucc.) Lem., family Cactaceae (first published in Cactées: 50. 1868.) — World Flora Online record, Wikidata.
- Pet toxicity: Pet safety not verified: the ASPCA does not list Sand Dollar Cactus, so we can't confirm whether it is safe for cats and dogs. Checked against the ASPCA plant list; any other toxicity note on this page comes from PlantoScan's plant database.
- Photo: Joseph Aubert, CC BY 4.0, iNaturalist — original.
- Hardiness zone: USDA Zone 10b – 12b, estimated from the plant's typical growing conditions.
- Care values(watering, light, temperature, humidity, soil, fertilizing): PlantoScan's plant database, filtered by automatic plausibility checks — values that fail them are hidden. How we source and check plant data.
Spotted a mistake? Email info@upvision.media with the page link — we check and correct reported errors.
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