Photo by Melody

PlantFiles: Mojave Mound Cactus, Giant Claret Cup, Salmon-flowered Hedgehog, Spiny Hedgehog
Echinocereus polyacanthus subsp. acifer

Family: Cactaceae (kak-TAY-see-ee) (Info)
Genus: Echinocereus (ek-in-oh-KER-ee-us) (Info)
Species: polyacanthus subsp. acifer

Synonym:Echinopsis valida var. densa
Synonym:Echinocereus polyacanthus var. densus
Synonym:Cereus acifer
Synonym:Echinocereus acifer

One member has or wants this plant for trade.

Cactus and Succulents

6-12 in. (15-30 cm)

18-24 in. (45-60 cm)
24-36 in. (60-90 cm)

USDA Zone 8b: to -9.4 C (15 F)
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

Handling plant may cause skin irritation or allergic reaction
Plant has spines or sharp edges; use extreme caution when handling

Bloom Color:
Scarlet (Dark Red)

Bloom Time:
Late Spring/Early Summer


Other details:
Drought-tolerant; suitable for xeriscaping
This plant may be considered a protected species; check before digging or gathering seeds
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:

Propagation Methods:
From herbaceous stem cuttings
From woody stem cuttings
From seed; direct sow outdoors in fall

Seed Collecting:
Allow unblemished fruit to ripen; clean and dry seeds
Unblemished fruit must be significantly overripe before harvesting seed; clean and dry seeds
Properly cleaned, seed can be successfully stored

Click thumbnail
to view:

By Lophophora
Thumbnail #1 of Echinocereus polyacanthus subsp. acifer by Lophophora

By Lophophora
Thumbnail #2 of Echinocereus polyacanthus subsp. acifer by Lophophora

By thistlesifter
Thumbnail #3 of Echinocereus polyacanthus subsp. acifer by thistlesifter


No positives
1 neutral
No negatives

Gardeners' Notes:

Neutral Xenomorf On May 27, 2007, Xenomorf from Valley of the Sun, AZ (Zone 9b) wrote:

This plant (and subspecies) can form clumps with as many as 400 heads
The 'polyacanthus' subspecies has smaller flowers being only 1.2 to 2.8 inches across. This is the most common of these subspecies.
The 'acifer' subspecies has scarlet red flowers that are 2.4 to 3.1 inches across and the stigma having 9 or 10 lobes.
The 'huitcholensis' subspecies has narrow salmon-pinkish orange blooms that are 1.8 to 3.1 inches across.
The 'pacificus' subspecies has smaller flowers than the other 3 subspecies being only 1.2 long and bright orange.

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