Previous species
Previous Species

Next Species
Next Species

Home Page

Order CD-ROMs from the site

Tell a Friend

Gardening Books

Gardening Catalogs


Siler Pincushion Cactus
Scientific Name: Pediocactus sileri (Engelmann ex Coulter) L. Benson
Family: Cactaceae
Listed in CITES Appendix 1
Recommended Temperature Zone:
USDA: 8-11

Minimum Avg. Temperature: 50F (10C)

Sun Exposure: Full sun

Origin: USA (southwestern Utah and northwestern Arizona), where it is restricted to a specific gypsum and salt-rich soil, from 3000 to 5500 feet elevation (900 to 1650 m)

Growth Habits: Solitary, occasionally clustered globose cactus, stems typically 4 inches tall (10 cm), but can reach up to 18 inches tall (45 cm), 3 to 4 inches in diameter); 3 to 7 brown central spines becoming white with age, 1 inch long (2.5 cm); 11 to 16 whitish radials.

Watering Needs: Regular water in late winter, early spring, and also in the fall, when it starts growing, very little water the rest of the time.


Potential threats include off-road vehicle traffic, and trampling by livestock, especially in wet soils. Gypsum mining is no longer considered a threat since the gypsum in P. sileri habitat is of low quality and quantity (source U.S. Fish and Wildlife Service).
The species was described based on specimens collected by A.L. Siler in May of 1883 at Cottonwood Springs and Pipe Springs. The species epithet was named after him.

Cultural Practices:
Can probably use some added gypsum in the soil mixture.

Blooming Habits:
Yellow flowers with purple veins, 1 inch in diameter (2.5 cm) during March and April.

Fruiting Habits:

Check for Field Collection numbers at Ralph Martin's Site

Sponsors: Michigan Bulb - 120 x 60 Lawns Banner! Gurney's 120 x 60 A

We do get a small commission out of these sponsors that helps financing the website.  Let us know if you are satisfied or dissatisfied of their services, since obviously we are trying to advertise only for reputable garden supply companies.  They might be helpful to get plants not generally available at the local garden center, getting a new and unusual gardening tool or get a discount Better Homes and Gardens magazine subscription.


Desert Tropicals Home Page | List of All the Plants | More in the Cactaceae family | Tell your friends about this page

Desert-Tropicals is dedicated to provide gardening advice, gardening ideas, and information about flower of all kind for landscape and collections. We try to check carefully the identification of the plants on the illustrations as well as the other information from the page, but occasionally errors do occur. if you notice anything that needs to be changed please contact us. Thanks.

1998-2005 Philippe Faucon, All Rights Reserved.