Mammillaria Species, Twin-Spined Cactus, Whitey

Mammillariageminispina

Family
Cactaceae (kak-TAY-see-ee)
Genus
Mammillaria (mam-mil-AR-ee-uh)
Species
geminispina (jem-in-ih-SPIN-uh)
Synonym
Mammillaria elegans
Sun Exposure
Full Sun
Sun to Partial Shade
Light Shade
Foliage
Height
6-12 in. (15-30 cm)
Spacing
3-6 in. (7-15 cm)
6-9 in. (15-22 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
Magenta (pink-purple)
Bloom Time
Late Spring/Early Summer
Mid 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
6.6 to 7.5 (neutral)
Patent Information
Non-patented
Propagation Methods
By dividing rhizomes, tubers, corms or bulbs (including offsets)
From woody stem cuttings
Allow cut surface to callous over before planting
From seed; direct sow after last frost
Seed Collecting
Allow pods to dry on plant; break open to collect seeds
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:

Mesa, Arizona

Phoenix, Arizona

Scottsdale, Arizona

Santa Barbara, California

Henderson, Nevada

San Antonio, Texas

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Gardener's Notes:

2
positives
2
neutrals
0
negative
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P
Acton, CA (Zone 8b) | July 2006 | positive

THis is an easy to grow species, and a highly variable one... some have very short spines, and you can almost pick them up without endang...Read More

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

The differences between the varieties and Type species are:
* var. geminispina has 2 central spines that are white with darker tip...Read More

A
Wavre/ greenhous +/- 2500 species, IA | February 2004 | neutral

Sorry, but the remark must be flowers in a ring in the new growth of the previous year
Greetings,
Albert (albleroy@tiscali.be)

A
Scottsdale, AZ (Zone 9b) | November 2003 | positive

I finally found the garden spike for this one: "Flowers spring-summer in a ring after the plants new growth. Filtered/direct sun." This...Read More

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