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Coryphantha

Coryphantha retusa

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Coryphantha retusa by Xenomorf
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Family
Cactaceae (kak-TAY-see-ee)
Info
Genus
Coryphantha (kor-ry-FAN-tha)
Info
Species
retusa (re-TOO-suh)
Info
Synonym
Coryphantha retusa var. retusa
Mammillaria cephalophora
Echinocactus cephalophorus
Melocactus mammillariaeformis
Cactus cephalophorus
Sun Exposure
Full Sun
Sun to Partial Shade
Light Shade
Foliage
Height
under 6 in. (15 cm)
Spacing
6-9 in. (15-22 cm)
9-12 in. (22-30 cm)
12-15 in. (30-38 cm)
Hardiness
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
Orange
Red-Orange
Pale Yellow
Bright Yellow
Bloom Time
Late Summer/Early Fall
Other Details
Category
Cactus and Succulents
Water Requirements
Drought-tolerant; suitable for xeriscaping
Average Water Needs; Water regularly; do not overwater
Foliage Color

Unknown - Tell us

Where to Grow
Can be grown as an annual
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
From woody stem cuttings
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
Properly cleaned, seed can be successfully stored
Regional

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

Phoenix, Arizona

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Gardener's Notes:

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1
positive
2
neutrals
0
negative
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C
C
CactusJordi
El Cajon, CA | August 2008 | neutral

According to literature this species is NOT offsetting and only very rarely has 1 central spine (typically none)

Jordi

T
T
TucsonJen
Tucson, AZ (Zone 9a) | September 2004 | positive

I just happened to be in line behind a couple who were buying one of these yesterday. It was a cluster of about 5 with the large central...Read More

X
X
Xenomorf
Phoenix, AZ (Zone 9b) | September 2004 | neutral

Another synonym of Coryphantha retusa is Cactus cephalophorus.

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