Giant Chin Cactus
Gymnocalycium saglionis subsp. tilcarense
Gymnocalycium saglionis (F.Cels) Britton and Rose is the correct and accepted scientific name for this cactus. It was named and described as such by Nathaniel Lord Britton and Joseph Nelson Rose in Cactaceae in 1922. It was first named Echinocactus saglionis by François Cels in Portefeuille des Horticulteurs in 1847.
Possibly Gymnocalycium saglionis subsp. tilcarense (Backeb.) H.Till & W.Till. This subspecies was named and described as such by Hans Till and Walter Till in Gymnocalycium in 1997. It was first named and described as Brachycalycium tilcarense by Curt Backeberg in Jahrbuch der Deutschen Kakteen in 1941. The subspecies is listed as a synonym of the species by Plants of the World Online.
The genus, Gymnocalycium Pfeiff. ex Mittler, was first named and described by Louis (Ludwig) Karl Georg Pfeiffer but the name was not validated. Then Ludwig Mittler described the genus using Mr. Pfeiffer’s description, giving him credit, in Taschenbuch für Cactusliebhaber in 1844. Plants of the World Online still lists 61 accepted species in the Gymnocalycium genus (as of 11-13-19 when I am updating this page). Numbers change frequently.
I brought this plant home from Lowe’s on March 29 (2019). The label stated it was a Gymnocalycium saglione but that is an incorrect spelling. It is, in fact, Gymnocalycium saglionis. It is from Altman Plants and I was glad to find one without the “strawflower’ hot-glued to the top.
It was in an 11 oz. (3 1/2” diameter x 3 1/4” tall) pot. The plant measures approximately 1 1/8″ tall x2 5/8” wide without the spines.
The label states:
“Gymnocalycium saglione, native to Argentina, forms flattened globes to 10” in diameter. Grayish-green globular cactus with elliptical areoles and recurved spines. Flowers are 2” diameter and white. Must be quite mature to flower. Protect from frost. Provide filtered light; hardy to 32F; to 10” tall. Water thoroughly when soil is dry.”
Zones: USDA Zones 9b-11 (25-40° F)
Size: Approximately 11-16″ diameter x 6-12″ or taller
Light: Sun to part shade
Soil: Very well-draining soil. Potting soil amended with pumice or chicken grit and perlite
Water: Regular watering during the summer. Very little in winter if any.
Since this plant is small, it has 1-3 nearly straight central spines depending on where you look, and 7-8 recurved radial spines. Llifle says the species has 1-3 central spines and 10-15 radial spines. The felted areoles sit on top of strangely large and globose looking tubercles. The subspecies Gymnocalycium saglionis subsp. tilcarense has longer spines and larger tubercles than the species. I haven’t seen the species in person, but my plant appears to have large tubercles and fairly long spines. So, it could possibly be the subspecies.
According to the Llifle (Encyclopedia of Living Forms) website, this plant needs a low pH soil or will stop growing. They tolerate bright light but can suffer from stunted growth and sun scorch if overexposed to direct sun during the hottest part of the day during the summer. Click on the link to Llifle below for further information.
I decided I needed to put this cactus in a larger pot on June 19. Not only had it outgrown its pot, but there was also a lot of excess potting soil around it.
It is quite happy now in its new pot. I used about 50/50 Miracle Grow Potting Soil and pumice. I used to use 2 parts of good potting soil with 1 part perlite and 1 part chicken grit. Pumice takes the place of both perlite and chicken grit plus contributes added nutrients to the soil.
I really like this cactus…
I had to move the potted plants inside on October 11 because an “F” was in the forecast. I always take photos of the plants and measure the cactus and some of the succulents. At the time, this plant measured 2 3/4″ tall x 2 7/8″ wide. It measured approximately 1 1/8″ tall x2 5/8” wide when I brought it home on March 30.
What can I say? I like photographing this plant…
This seems to be a very happy cactus and easy to grow as long as you follow the few basic rules. Bright light, very well-draining potting soil, water when dry during the summer and barely ever in the winter (like maybe once in the middle). I just make sure they have a good drink before I bring them inside.
I will continue adding more photos and information as time goes by.
I hope you enjoyed this page and maybe found it useful. If you have any comments, questions or suggestions, I would like to hear from you. Please click on “like” if you visited this page. It helps us bloggers stay motivated. 🙂 You can check out the links below for further reading. The links take you directly to the genus and species of this plant.