How to Grow Starfish Cactus
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Starfish Cactus
Stapelia asterias
succulentStapelia asterias is a low-growing succulent native to South Africa, known for its distinctive star-shaped flowers with intricate maroon and yellow patterns. The plant produces fleshy, angular green stems and blooms with large, velvety flowers that emit a carrion-like scent to attract pollinators. It is prized by collectors for its unusual appearance and dramatic flowering.
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Example Starfish Cactus timeline · Pittsburgh, PA (Zone 6b)
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Plant Starfish Cactus
Around Apr 17Near Pittsburgh's average last spring frost.
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Tend & protect
Late spring–summerWatering, feeding, and pest-watch reminders.
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Harvest Starfish Cactus
Late summer into fallBefore the first fall frost (≈ Nov 8)
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Growing Conditions
Soil
Growing Zones
Find your zone →Thrives in zones 10-11; grow indoors or in containers elsewhere
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Get my Starfish Cactus timeline →Growth Stages
Seedling
4-6 weeksTiny sprouted seeds with minimal stem growth and first pair of rudimentary leaves
Keep soil lightly moist, provide bright indirect light, maintain warmth (70-75°F). Cover with plastic dome to retain humidity initially.
Juvenile Growth
2-3 monthsSmall fleshy stems beginning to develop angular characteristics, 2-3 inches tall
Gradually reduce humidity, allow soil to dry more between waterings, increase light exposure. Transplant to individual pots when 1-2 inches tall.
Vegetative
6-12 monthsMature stem growth with characteristic 4-6 angled green stems, plant sprawling and clustering
Water when soil is completely dry, provide bright indirect light, maintain temperatures 50-75°F. Fertilize lightly monthly with diluted succulent fertilizer during growing season.
Pre-flowering
1-2 monthsStems reach mature size (4-6 inches), flower buds form at stem bases or sides
Provide cool period in winter (50-60°F) for 4-6 weeks to trigger blooming. Reduce water and maintain lower temperatures.
Flowering
1-3 months (multiple successive blooms)Large (2-3 inch) five-petaled star-shaped flowers with maroon/brown and yellow coloring, velvety texture, and distinctive odor
Do not move plant during blooming, maintain consistent conditions, observe flowers which typically last 1-2 weeks each. Allow pollination or hand-pollinate for seed production.
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
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Inspect regularly, remove with cotton swab dipped in rubbing alcohol, spray with neem oil or insecticidal soap if severe
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Improve drainage, reduce watering frequency, repot in fresh dry soil if roots are mushy, allow to dry completely between waterings
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Increase humidity slightly if needed, spray with water, use neem oil or miticide in severe cases
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Remove manually with tweezers, treat with horticultural oil or neem oil spray
Uses
Unusual Houseplant and Collector's Specimen
OrnamentalStapelia asterias is grown as an indoor ornamental succulent for its dramatic, intricately patterned flowers and unique sculptural form. Its rarity and striking appearance make it highly valued by succulent collectors. [source]
Botanical Photography and Specimen Growing
CraftThe plant's unusual star-shaped flowers and distinctive texture make it popular for botanical photography, terrariums, and specialized succulent collections. It is often featured in collector's exhibits. [source]
Pollinator Attraction (Flies and Carrion Beetles)
WildlifeThe plant's distinctive carrion scent attracts flies and carrion beetles that pollinate its flowers. Growing Stapelia species supports specialized pollinator relationships. [source]
Plant Propagation and Breeding Study
EducationalStapelia asterias demonstrates interesting reproductive strategies and is used in educational settings to study succulent propagation, seed germination, and plant evolution. [source]
Harvest Tips
Stapelia asterias is not harvested for plant material. Flowers bloom in summer and early fall and last 1-2 weeks each. For seed collection, hand-pollinate flowers using a small brush, and collect seed pods when they mature and dry (allow 2-3 months post-pollination). Seeds should be harvested when pod splits naturally.
Fun Facts
- 🌱 The common name 'Starfish Cactus' is misleading—Stapelia is not a true cactus but a succulent in the Apocynaceae family. It is sometimes called 'Carrion Flower' due to its distinctive rotting-meat scent that attracts flies for pollination.
- 🌱 The intricate star-shaped flowers have a velvety texture with distinctly patterned ridges and can measure 2-3 inches across; the scent is most pungent in the morning and afternoon.
- 🌱 Stapelia asterias is native to South Africa and was scientifically named after the Dutch botanist Johannes Bodaeus van Stapel in the 17th century; the genus includes over 40 species, many with similarly dramatic flowers.
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