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Echinocereus Species, Arizona Rainbow Hedgehog, Sonoran Rainbow Cactus

Echinocereusrigidissimus

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Echinocereus rigidissimus by Kelli
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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
Cereus pectinatus var. rigidissimus
Echinocereus pectinatus var. rigidissimus
Sun Exposure
Full Sun
Sun to Partial Shade
Light Shade
Foliage

Unknown - Tell us

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)
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
Other Details
Category
Tropicals and Tender Perennials
Cactus and Succulents
Water Requirements
Drought-tolerant; suitable for xeriscaping
Foliage Color

Unknown - Tell us

Where to Grow
Can be grown as an annual
Suitable for growing in containers
Bloom Characteristics

Unknown - Tell us

Bloom Size

Unknown - Tell us

Other details

Unknown - Tell us

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
Regional

This plant is said to grow outdoors in the following regions:

Chandler, Arizona

Hereford, Arizona(2 reports)

Maricopa, Arizona

Patagonia, Arizona

Phoenix, Arizona(2 reports)

Rio Rico, Arizona

Scottsdale, Arizona

Tucson, Arizona(3 reports)

Canoga Park, California

Hesperia, California

Spring Valley, California

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Xenomorf
Phoenix, AZ (Zone 9b) | April 2005 | positive

The subspecies 'rigidissumus' has stems that reach over 4 inches thick with 15-23 radial spines per areole.
The subspecies 'rubisp...Read More

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