Photo by Melody

PlantFiles: Bishop's Miter, Bishop's Cap, Mitra, Bonete de Obispo
Astrophytum myriostigma

Family: Cactaceae (kak-TAY-see-ee) (Info)
Genus: Astrophytum (ass-troh-FY-tum) (Info)
Species: myriostigma (my-ree-oh-STIG-muh) (Info)

Synonym:Astrophytum myriostigma var. myriostigma
Synonym:Echinocactus myriostigma
Synonym:Astrophytum prismaticum

8 members have or want this plant for trade.

Cactus and Succulents

under 6 in. (15 cm)
6-12 in. (15-30 cm)

6-9 in. (15-22 cm)
9-12 in. (22-30 cm)
12-15 in. (30-38 cm)
15-18 in. (38-45 cm)

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
Light Shade


Bloom Color:
Pale Yellow
Bright Yellow

Bloom Time:
Mid Summer
Late Summer/Early Fall
Mid Fall


Other details:
This plant is suitable for growing indoors
Drought-tolerant; suitable for xeriscaping
Average Water Needs; Water regularly; do not overwater
This plant may be considered a protected species; check before digging or gathering seeds

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 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

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There are a total of 32 photos.
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4 positives
1 neutral
No negatives

Gardeners' Notes:

Positive Bronto On Oct 15, 2011, Bronto from Scottsdale, AZ wrote:

The Bishop's cap cactus seems virtually indestructible in a pot indoors, or outside in soil or pot with good drainage in warm/desert climate. A great plant for novice cactus enthusiast, will survive well indoors in sunny window, leave mostly dry in cold weather. A potted specimen moved from LA to a pot in Alaska, into the ground in Arizona, and then into a pot again has survived for over 25 years, and is now 18" in height. It has not been repotted in 10 years.

Positive palmbob On Mar 18, 2008, palmbob from Acton, CA (Zone 8b) wrote:

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 all sorts of random watering strategies, bright, searing hot, full day sun (got to 120F few years ago and didn't affect these), and down to 25F with no damage... and some live in almost total shade (no direct sunlight at all) and do fine. All live outdoors and get drenched all winter long by our cold rains here in southern California, and to no ill effects whatsoever (though most cacti tolerate our freezing cold rains for some reason despite everyone's recommendations to keep them dry in winter). Never had one of these rot. The move easily, have no spines, look great all year round in any condition... just about one of the most perfect cacti you can grow I think.

Neutral cactus_lover On Nov 4, 2005, cactus_lover from FSD
Pakistan (Zone 10b) wrote:

Many varieties/forms discribed for this species including the columnar V,columnare.Tsuda,the four ribbed V, quadricostatum.Baum and the flock-less V,nudum.

Positive Happenstance On Aug 31, 2003, Happenstance from Northern California, CA wrote:

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

Positive philomel On Nov 30, 2002, philomel from Castelnau RB Pyrenes
France (Zone 8a) wrote:

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

It should be kept dry over winter.


This plant has been said to grow 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
Palacios, Texas

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