Sea Urchin Cactus, Cory-Cactus Hedgehog, Prickly Beehive Cactus

Coryphanthaechinus

Family
Cactaceae (kak-TAY-see-ee)
Genus
Coryphantha (kor-ry-FAN-tha)
Species
echinus (EK-in-us)
Synonym
Coryphantha radians var. echinus
Coryphantha cornifera var. echinus
Coryphantha pectinata
Mammillaria radians var. echinus
Mammillaria echinus
Sun Exposure
Full Sun
Sun to Partial Shade
Height
under 6 in. (15 cm)
Spacing
3-6 in. (7-15 cm)
6-9 in. (15-22 cm)
9-12 in. (22-30 cm)
Hardiness
USDA Zone 6a: to -23.3 °C (-10 °F)
USDA Zone 6b: to -20.5 °C (-5 °F)
USDA Zone 7a: to -17.7 °C (0 °F)
USDA Zone 7b: to -14.9 °C (5 °F)
USDA Zone 8a: to -12.2 °C (10 °F)
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)
Danger
Plant has spines or sharp edges; use extreme caution when handling
Bloom Color
Bright Yellow
Bloom Time
Late Spring/Early Summer
Other Details
Category
Cactus and Succulents
Water Requirements
Drought-tolerant; suitable for xeriscaping
Average Water Needs; Water regularly; do not overwater
Foliage Color
Where to Grow
Can be grown as an annual
Bloom Characteristics
Bloom Size
Other details
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
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
Properly cleaned, seed can be successfully stored
Regional

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

Hesperia, California

Vista, California(9 reports)

East Haddam, Connecticut

Las Cruces, New Mexico

Kermit, Texas

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Gardener's Notes:

4
positives
1
neutral
0
negative
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D
East Haddam, CT | December 2010 | positive

This plant is at the limit of its hardiness here in an eastern Zone 6b. Some years it survives, other years it doesn't. Very prone to r...Read More

T
Vista, CA | December 2007 | positive

Four clones of this nice Cory. These clones were grown from seed collected near Big Bend Texas. These are said to grow in a region wher...Read More

O
Las Cruces, NM (Zone 8a) | July 2007 | positive

Coryphantha echinus is dimorphic (existing in two forms) with regard to the central spine. Mature plants may have from zero to four centr...Read More

X
Phoenix, AZ (Zone 9b) | December 2005 | neutral

More synonyms of this are: Mammillaria pectinata, Cactus pectinatus & Cactus echinus.

L
Kermit, TX (Zone 7b) | June 2005 | positive

Long, stout, central spines stand straight out from the stem, giving the plant its sea urchin appearance. These central spines are near...Read More

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