Haworthia Species, Star Cactus

Haworthiaretusa

Family
Asphodelaceae (as-foh-del-AY-see-ee)
Genus
Haworthia (ha-WORTH-ee-a)
Species
retusa (re-TOO-suh)
Synonym
Aloe retusa
Apicra retusa
Catevala retusa
Sun Exposure
Sun to Partial Shade
Light Shade
Partial to Full Shade
Foliage
Grown for foliage
Textured
Height
under 6 in. (15 cm)
Spacing
12-15 in. (30-38 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)
Bloom Color
White/Near White
Cream/Tan
Bloom Time
Mid Spring
Late Spring/Early Summer
Mid Summer
Other Details
Category
Alpines and Rock Gardens
Groundcovers
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 leaf cuttings
Allow cut surface to callous over before planting
From seed; direct sow after last frost
From seed; germinate in vitro in gelatin, agar or other medium
Seed Collecting
Bag seedheads to capture ripening seed
Allow pods to dry on plant; break open to collect seeds
Seed does not store well; sow as soon as possible
Regional

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

Phoenix, Arizona

Brea, California

Los Angeles, California

Paradise, California

Pleasant Hill, California

Thousand Oaks, California

Grenoble, Rhône-Alpes

Millersview, Texas

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Gardener's Notes:

3
positives
0
neutral
0
negative
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M
M
Philadelphia, PA | April 2010 | positive

I have enjoyed this plant knowing very little about it. It's content to grow with regular weekly and semi weekly waterings in a bright s...Read More

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

One of the more common species in cultivation, and a pretty easy grower as long as you keep it out of hot sun and don't rot it by overwat...Read More

H
Northern California, CA | August 2003 | positive

Native of the Cape Province of South Africa.

Easy to grow, lots of off-sets that can be potted seperately, but I just leav...Read More

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