Photo by Melody

PlantFiles: Red-headed Irishman
Mammillaria spinosissima

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Family: Cactaceae (kak-TAY-see-ee) (Info)
Genus: Mammillaria (mam-mil-AR-ee-uh) (Info)
Species: spinosissima (spin-oh-SIS-ee-muh) (Info)

Synonym:Mammillaria spinosissima subsp. spinosissima
Synonym:Mammillaria auricoma
Synonym:Mammillaria pitcayensis
Synonym:Mammillaria centraliplumosa
Synonym:Mammillaria virginis

2 members have or want this plant for trade.

Category:
Cactus and Succulents

Height:
6-12 in. (15-30 cm)

Spacing:
3-6 in. (7-15 cm)
6-9 in. (15-22 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)

Sun Exposure:
Full Sun
Sun to Partial Shade
Light Shade

Danger:
Plant has spines or sharp edges; use extreme caution when handling

Bloom Color:
Magenta (Pink-Purple)
Fuchsia (Red-Purple)

Bloom Time:
Late Winter/Early Spring
Mid Spring

Foliage:
Unknown - Tell us

Other details:
Drought-tolerant; suitable for xeriscaping
Average Water Needs; Water regularly; do not overwater
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:
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

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By Xenomorf
Thumbnail #1 of Mammillaria spinosissima by Xenomorf

By Xenomorf
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By Xenomorf
Thumbnail #3 of Mammillaria spinosissima by Xenomorf

By Xenomorf
Thumbnail #4 of Mammillaria spinosissima by Xenomorf

By cacti_lover
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By cacti_lover
Thumbnail #6 of Mammillaria spinosissima by cacti_lover

By cacti_lover
Thumbnail #7 of Mammillaria spinosissima by cacti_lover

There are a total of 18 photos.
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Profile:

3 positives
1 neutral
No negatives

Gardeners' Notes:

RatingAuthorContent
Positive JohnTS71 On Mar 28, 2010, JohnTS71 from San Antonio, TX (Zone 9a) wrote:

I wonder if someone can changed the hardiness of this plant? I was afraid I was going to lose this with a hard freeze of 13 and several more in the low 20's but to my surprise I didn't!

Positive NancySLAZ On Nov 27, 2009, NancySLAZ from Sun Lakes, AZ (Zone 9a) wrote:

This plant grows very well for me, except I want to point out that you need to watch the sun exposure because mine got sunburned quickly on one side until I moved it. It prefers bright light but not direct sun on the plant.

Neutral Xenomorf On Apr 10, 2005, Xenomorf from Valley of the Sun, AZ (Zone 9b) wrote:

The subspecies 'spinosissima' only rarely grows higher than 12 inches. It has dirty white spines and does not have the bristles in the axils most of the time.
The subspecies 'tepoxlana' has yellow spines.
The subspecies 'pilcayensis' has whiter spines and the stems can grow to 20 inches long/high. It might have some latex/bristles in the axils.
The flowers are purple-pink on all subspecies.

Another synonym of this plant is Mammillaria haasii

Positive cacti_lover On Apr 9, 2005, cacti_lover from Henderson, NV (Zone 9b) wrote:

This cactus can grow to over 12" tall and 4" thick. Mostly solitary but can form pups on old plants. It is very variable due to it's wide area of origin in Mexico. The color of the spines are usually red or rust (common name Red headed Irishman), but can be white. Flowers are red to deep pink in color and are about 3/4" across.

Regional...

This plant has been said to grow in the following regions:

Chandler, Arizona
Phoenix, Arizona
Huntington Beach, California
Mountain View, California
Pleasant Hill, California
San Diego, California (2 reports)
Fort Walton Beach, Florida
Melbourne Beach, Florida
San Antonio, Texas



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