Acanthocalycium glaucum
Acanthocalycium glaucum
Acanthocalycium glaucum
Acanthocalycium glaucum
Acanthocalycium glaucum
Acanthocalycium glaucum
Acanthocalycium glaucum
Acanthocalycium glaucum
Acanthocalycium glaucum
Acanthocalycium glaucum
Acanthocalycium glaucum
Acanthocalycium glaucum

Acanthocalycium Glaucum Red Tom Thumb

(This plant comes in a 3.5" pot. You will receive a very similar plant to the one in the picture. It may or may not be blooming at the time of your purchase. The plant is shipped in its pot to prevent any damage to the roots).

Acanthocalycium glaucum is commonly known as ‘Red Tom Thumb’. It can reach up to the height of 15 cm and belongs to the Cactaceae family. Having an origin in Bolivia, this summer-dormant plant is a solitary flat globular shape to a briefly elongated cactus. 

Growth Rate

Acanthocalycium glaucum has a slow growth rate. 


The Acanthocalycium genus is well-known for its blooms. The cacti bloom in the spring and continue to bloom until the summer, producing orange flowers.

Watering and Feeding

Acanthocalycium genus plants require moderate watering and should be watered every three to four days during the summer. Reduce watering to once a week or less in the winter. Do not overwater.


Well-drained soil is ideal for the Red tom thumb cactus. Repotting is best done early in the growing season (spring) or late in the season (summer). 


This attractive plant is not frost-hardy. It has a frost tolerance of - 4° C (24.8° F) and belongs to the hardiness zone of 9b to 11.


Acanthocalycium glaucum, like many other cacti, thrives in full sun. Place them in an open, airy area that receives full sun exposure throughout the day.


The cactus can be grown from seed. Growing cactus from seed can be a thrilling experience as you watch the tiny seedlings change appearance so quickly.

The Red tom thumb cactus is the best succulent for your home as well as office. This beautiful plant will make you fall in love with them. 

Some of the information in this description has been found at, and

Blooming Season Spring-summer
Common Name Red tom thumb
Dormancy Summer
Family Cactaceae
Flower Orange
Frost Tolerance - 4c°
Growth Rate Slow
Hardiness Zone 9b to 11
Height 15 cm
Origin Bolivia
Pot Size 3.5"
Scientific Name Acanthocalycium glaucum
Shape Globose
Sun Exposure Full sun
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beau c.
United States United States

Good cactus

Overall beautiful cactus, my only complaint is that it is about half the size of the one in the picture. Other than that, it’s beautiful healthy and shipped quickly.

Acanthocalycium glaucum

1 review

SKU: 174

Regular price $ 12.99 Save 0%
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Colder regions warning: If you are expecting temperatures below 40 degrees within the next five days after placing your order, we highly recommend adding a heat pack to your order. We are now offering 72-hour heat packs by request. If your order is $50.00 or more, you will get a heat pack free of charge. To prevent plants from freezing while in transit, orders placed for areas with extreme severe freezing temperatures will be held for shipment until it is safe to ship. Care instructions are included in every package you order. We ship via USPS Priority Mail, and we calculate the shipping cost based on the weight and volume of your purchase. Depending on your location, we will ship the plants on a certain day to avoid transit time during weekends or holidays. If you have any questions or comments, please feel free to contact us at any time.