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PlantFiles: Arizona Rainbow Hedgehog, Sonoran Rainbow Cactus, Cabeza de Viejo
Echinocereus rigidissimus

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Family: Cactaceae (kak-TAY-see-ee) (Info)
Genus: Echinocereus (ek-in-oh-KER-ee-us) (Info)
Species: rigidissimus (rig-id-ISS-ih-mus) (Info)

Synonym:Echinocereus rigidissimus subsp. rigidissimus
Synonym:Cereus pectinatus var. rigidissimus
Synonym:Echinocereus pectinatus var. rigidissimus

3 members have or want this plant for trade.

Category:
Tropicals and Tender Perennials
Cactus and Succulents

Height:
6-12 in. (15-30 cm)

Spacing:
3-6 in. (7-15 cm)
6-9 in. (15-22 cm)

Hardiness:
USDA Zone 9a: to -6.6 C (20 F)
USDA Zone 9b: to -3.8 C (25 F)
USDA Zone 10a: to -1.1 C (30 F)
USDA Zone 10b: to 1.7 C (35 F)
USDA Zone 11: above 4.5 C (40 F)

Sun Exposure:
Full Sun
Sun to Partial Shade
Light Shade

Danger:
Plant has spines or sharp edges; use extreme caution when handling

Bloom Color:
Magenta (Pink-Purple)
Red

Bloom Time:
Late Spring/Early Summer
Mid Summer

Foliage:
Unknown - Tell us

Other details:
This plant is suitable for growing indoors
Drought-tolerant; suitable for xeriscaping
Suitable for growing in containers

Soil pH requirements:
6.1 to 6.5 (mildly acidic)
6.6 to 7.5 (neutral)
7.6 to 7.8 (mildly alkaline)

Patent Information:
Non-patented

Propagation Methods:
By dividing rhizomes, tubers, corms or bulbs (including offsets)
Allow cut surface to callous over before planting
From seed; direct sow after last frost

Seed Collecting:
Allow unblemished fruit to ripen; clean and dry seeds
Unblemished fruit must be significantly overripe before harvesting seed; clean and dry seeds

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By Kelli
Thumbnail #1 of Echinocereus rigidissimus by Kelli

By Xenomorf
Thumbnail #2 of Echinocereus rigidissimus by Xenomorf

By Xenomorf
Thumbnail #3 of Echinocereus rigidissimus by Xenomorf

By Xenomorf
Thumbnail #4 of Echinocereus rigidissimus by Xenomorf

By franj
Thumbnail #5 of Echinocereus rigidissimus by franj

By franj
Thumbnail #6 of Echinocereus rigidissimus by franj

By Xenomorf
Thumbnail #7 of Echinocereus rigidissimus by Xenomorf

There are a total of 13 photos.
Click here to view them all!

Profile:

1 positive
No neutrals
No negatives

Gardeners' Notes:

RatingAuthorContent
Positive Xenomorf On Apr 23, 2005, Xenomorf from Valley of the Sun, AZ (Zone 9b) wrote:

The subspecies 'rigidissumus' has stems that reach over 4 inches thick with 15-23 radial spines per areole.
The subspecies 'rubispinus' has stems that only get about 2 1/2 inches thick with 30-35 radial spines per areole. The spines are also more Ruby/pinkish colored compared to the 'rigidissimus' subspecies.
The flowers on both are bright pinkish-red or magenta or red with white throats.

I've seen these growing in the wild on the West Ruby Road Trail in Arizona (South of Tucson), off of Interstate 19 through to Ruby, AZ and on to Arivaca, AZ.

Regional...

This plant has been said to grow in the following regions:

Chandler, Arizona
Hereford, Arizona (2 reports)
Maricopa, Arizona
Patagonia, Arizona
Phoenix, Arizona
Rio Rico, Arizona
Scottsdale, Arizona
Tucson, Arizona (2 reports)
Canoga Park, California
Hesperia, California
Spring Valley, California



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