Gymnocalycium Species, Spider Cactus

Gymnocalyciumdenudatum

Family
Cactaceae (kak-TAY-see-ee)
Genus
Gymnocalycium (jim-no-kal-LISS-ee-um)
Species
denudatum (dee-noo-DAY-tum)
Synonym
Gymnocalycium megalothelon
Sun Exposure
Sun to Partial Shade
Light Shade
Height
under 6 in. (15 cm)
Spacing
6-9 in. (15-22 cm)
9-12 in. (22-30 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
Pale Pink
Pink
Pale Yellow
White/Near White
Bloom Time
Mid Summer
Other Details
Category
Cactus and Succulents
Water Requirements
Drought-tolerant; suitable for xeriscaping
Foliage Color
Where to Grow
Can be grown as an annual
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
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 unblemished fruit to ripen; clean and dry seeds
Unblemished fruit must be significantly overripe before harvesting seed; clean and dry seeds
Regional

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

Phoenix, Arizona(2 reports)

Tucson, Arizona

Grenoble, Rhône-Alpes

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Gardener's Notes:

2
positives
0
neutral
0
negative
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P
Phoenix, AZ | February 2015 | positive

Central Phoenix -- This cactus has been growing in the ground in my garden, sandwiched between a large sedimentary rock and a cement pave...Read More

P
Acton, CA (Zone 8b) | July 2004 | positive

Small globular green cactus with nearly harmless spines flattened against body in shape of small, white spiders. Large flowers of pale p...Read More

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