Astrophytum Asterias Nudum

The Astrophytum Asterias Nudum is a botanical marvel resulting from a natural mutation of Astrophytum asterias, characterized by the absence of white flakes on the epidermis. This gives it a smooth surface, matte green to dark green, highlighting its unique star-shaped silhouette.

This small, flattened, globular cactus appeals to collectors for its elegant simplicity, perfect symmetry, and graphic appearance. Its flat ribs (usually 8) are well defined and bordered with small woolly areoles arranged with precision. The absence of white marbling makes it visually more minimalistic than its classic relatives.

In cultivation, it is an exceptional plant: aesthetic, compact, rare, and highly photogenic. It is usually grown in pots, in well-drained substrate, protected from excess moisture. Its growth is slow but steady when properly cared for.

When it flowers, it produces beautiful yellow flowers with a red or orange throat, creating a striking contrast with the green epidermis. Flowering mainly occurs in spring and summer.

Astrophytum Asterias is native to northeastern Mexico (state of Tamaulipas) and southern Texas, in desert or semi-desert areas. The nudum cultivar is a horticultural selection, rare in the wild, that became popular among Japanese collectors.

In its native habitat, it grows on gravelly, well-exposed terrain, often flat on the ground, camouflaged by its low shape and earthy coloration.

To keep your Astrophytum Asterias Nudum healthy and encourage flowering:

🌞 Direct sunlight: Requires at least 5 to 6 hours of direct light per day. It is a full-sun cactus, well suited to greenhouses or south-facing windows.

🌤️ Sunburn warning: During heatwaves, especially for young plants, provide light shade during the hottest hours.

Like all Astrophytums, it is sensitive to excess moisture:

🌱 Spring / Summer: Water every 15 to 20 days, allowing the substrate to dry completely between waterings.

🍂 Autumn / Winter: Stop watering as soon as temperatures drop below 10°C.

⚠️ Never leave water standing in the saucer, as this is a major cause of rot.

🌡️ Ideal range: Between 22°C and 30°C during the growing season.

❄️ Minimum tolerated: Around 5°C, provided the substrate remains dry.

🏡 Wintering: Move it to a bright, unheated location with completely dry substrate.

🪨 Well-drained, mineral substrate: 50% cactus soil + 30% pumice or perlite + 20% pozzolana.

The Astrophytum Asterias Nudum flowers readily in pots when mature:

🌸 Period: Spring through late summer.

🎨 Color: Lemon yellow with an orange or red throat.

🌼 Feature: Flowers may last 2 to 4 days and appear several times during the season.