Gymnocalycium saglionis

Natural range and habitat of Gymnocalycium saglionis

Gymnocalycium saglionis is native to north-western Argentina, including Salta, Tucumán, Catamarca, La Rioja and north-eastern San Juan. It grows on dry hills, low mountains and rocky slopes.

The thick ribbed stem stores water through dry periods and expands again when moisture becomes available.

How to care for Gymnocalycium saglionis

• Position: Give this cactus plenty of light and enough room for its body to widen. Introduce direct sun gradually, especially after a move from lower light.
• Pot: Use a stable container because an older plant becomes broad and heavy. Repot when roots fill the pot or the old mix begins to drain slowly.
• Water: During periods of visible growth, soak the mix thoroughly and wait until it has dried before watering again. Water less often when the cactus is barely growing.
• Potting mix: Use a gritty cactus mix with plenty of pumice, lava rock or grit so excess water drains quickly.
• Temperature and humidity: Keep it warm, protect it from frost, and give it good airflow around the dense spines. Normal household humidity is suitable.
• Feeding: A dilute cactus fertiliser during periods of new growth is enough.

Common problems with Gymnocalycium saglionis

• The newest growth becomes narrow and pale: Light is too weak. Increase brightness gradually so later growth stays broad and compact.
• Dry yellow-white or corky patches appear: The cactus received stronger direct sun too quickly. Move it to bright filtered light, then reintroduce direct sun gradually.
• The lower stem becomes soft or black: Rot has developed because the mix stayed wet for too long. Cut affected tissue back to a firm clean margin with a sterile tool, discard the rotten tissue, let the wound dry, and repot the healthy cactus in fresh gritty mix.
• White cottony material appears between the spines or around the roots: Check for mealybugs. Isolate the plant and repeat a suitable treatment as directed on the label.

Gymnocalycium saglionis has sharp parts

• Keep this plant away from children and pets because its effects after chewing or swallowing are unclear.
• Sharp spines can puncture the mouth, eyes, skin or paws.
• Handle it carefully. Contact a veterinarian or medical professional after a serious injury, especially to the eye.

When was Gymnocalycium saglionis first published, and what does it mean?

The genus name Gymnocalycium means naked calyx. Saglionis honours Joseph Saglio.

Ludwig Mittler established the genus Gymnocalycium in 1844 in Taschenbuch für Cactusliebhaber, volume 2, page 124; Louis Karl Georg Pfeiffer had proposed the name.

Jacques Philippe Martin Cels first described it as Echinocactus saglionis in 1847 in Portefeuille Horticole, volume 1, page 180. Nathaniel Lord Britton and Joseph Nelson Rose later placed it in Gymnocalycium as Gymnocalycium saglionis in 1922 in The Cactaceae, volume 3, page 157.