Astrophytum Species, Bishop's Cap, Bishop's Hat, Bishop's Miter Cactus

Astrophytummyriostigma

Family
Cactaceae (kak-TAY-see-ee)
Genus
Astrophytum (ass-troh-FY-tum)
Species
myriostigma (my-ree-oh-STIG-muh)
Synonym
Astrophytum myriostigma var. myriostigma
Echinocactus myriostigma
Astrophytum prismaticum
Sun Exposure
Full Sun
Sun to Partial Shade
Light Shade
Foliage
Height
under 6 in. (15 cm)
6-12 in. (15-30 cm)
Spacing
6-9 in. (15-22 cm)
9-12 in. (22-30 cm)
12-15 in. (30-38 cm)
15-18 in. (38-45 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
N/A
Bloom Color
Pale Yellow
Bright Yellow
Bloom Time
Mid Summer
Late Summer/Early Fall
Mid Fall
Other Details
Category
Cactus and Succulents
Water Requirements
Drought-tolerant; suitable for xeriscaping
Average Water Needs; Water regularly; do not overwater
Foliage Color
Bronze
Where to Grow
Suitable for growing in containers
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; winter sow in vented containers, coldframe or unheated greenhouse
From seed; sow indoors before last frost
From seed; direct sow after last frost
Seed Collecting
Collect seedhead/pod when flowers fade; allow to dry
Allow unblemished fruit to ripen; clean and dry seeds
Properly cleaned, seed can be successfully stored
Regional

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

Chandler, Arizona

Gold Canyon, Arizona

Maricopa, Arizona

Phoenix, Arizona

Scottsdale, Arizona

Tucson, Arizona(2 reports)

Brea, California

Carlsbad, California

Castro Valley, California

Perris, California

Reseda, California

San Diego, California

Grenoble, Rhône-Alpes

Palacios, Texas

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Gardener's Notes:

4
positives
1
neutral
0
negative
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B
B
Scottsdale, AZ | October 2011 | positive

The Bishop's cap cactus seems virtually indestructible in a pot indoors, or outside in soil or pot with good drainage in warm/desert clim...Read More

P
Acton, CA (Zone 8b) | March 2008 | positive

In my garden this is one of the easiest and hardiest cactus to my forms of abuse I own. I have about 10 of these now, and they survive a...Read More

C
(Zone 10b) | November 2005 | neutral

Many varieties/forms discribed for this species including the columnar V,columnare.Tsuda,the four ribbed V, quadricostatum.Baum and the f...Read More

H
Northern California, CA | August 2003 | positive

Easy to grow cactus, flowers readily, most used common name is Bishops's Cap. Was Echincactus myrostigma.

P
(Zone 8a) | November 2002 | positive

This plant has showy yellow flowers between June and September. However, the rest of the year it gives pleasure from its interesting form...Read More

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