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

Synonym:Apicra retusa

Synonym:Catevala retusa

Category
Alpines and Rock Gardens
Groundcovers
Cactus and Succulents

Water Requirements
Drought-tolerant; suitable for xeriscaping

Sun Exposure
Sun to Partial Shade
Light Shade
Partial to Full Shade

Foliage
Grown for foliage
Textured

Foliage Color

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)

Where to Grow
Can be grown as an annual

Danger

Bloom Color
White/Near White
Cream/Tan

Bloom Characteristics

Bloom Size

Bloom Time
Mid Spring
Late Spring/Early Summer
Mid Summer

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