Star Cactus Astrophytum
Other plants called Star Cactus:
Previously known as:
- Digitostigma
- Maierocactus
- Phonetic Spelling
- as-tro-FY-tum
- Description
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The genus, Astrophytum or star cactus, is native perennial cactus of Southern Texas and Mexico and has 6 accepted species. They are found in areas that have hot, muggy summers and short, dry winters. The genus name, Astrophytum, originates from two Greek words, astron, meaning "star" and phyton meaning "plant." These cacti are very popular and have over a 100 cultivars. The species and cultivars vary in shape, form, texture, and whether they have spines or not.
These cacti prefer full sun and well-drained, acidic, sandy soil or potting mix that is suitable for cactus and succulents. The soil needs to dry out completely between waterings. They are intolerant to standing water or soggy soils. They are drought and dry soils tolerant. As the weather turns cool, they should be kept dry. They can tolerate summer temperatures of 70 to 95 degrees Fahrenheit, and winter temperatures of 40 to 70 degrees Fahrenheit. They thrive in dry and semi-arid climates. Indoor cacti will overwinter in a cool, dry room with some sunshine.
The different species have different characteristics. Some are short and stubby while others are columnar can reach 1 inch to 6 feet tall. Some species have green stems while others tend to be grayish. Some species have spines and others are spineless. Some have a star-shape form, dome-like, or have long narrow, cylinder-like stems. The flowers are funnel-shaped and have many petals. The flower color ranges from white to yellow with orange or red centers. The fruits are red to olive-green berries that contain many seeds.
The star cactus is considered vulnerable due to collection and loss of habitat. The species, Astrophytum asterias or sand dollar cactus, is listed as endangered by the United States Fish and Wildlife Service. However, there are many cultivars available.
One of the unique cultivars would be add interest on a window sill or sunny room. In warm, dry climates, consider a container plant on the patio or garden area.
Insects, Diseases, and Other Plant Problems: Monitor for mealy bugs, scale, and spider mites. Overwatering, poor drainage or soggy soils can result in root rot or fungal infections.
- See this plant in the following landscape:
- Cultivars / Varieties:
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- Astrophytum asterias cv. Superkabuto
button shape, fuzzy texture with extensive white spots on the the surface, yellow bloom with red center - Astrophytum asterias 'Kikko'
round, hexagon shaped areoles with white dots - Astrophytum asterias (Sand Dollar Cactus)
short, stubby, 2. 5 inches tall, 6 inches wide, globe-shape, 8 ribs that dotted with white tufts, yellow blooms/orange center - Astrophytum capricorne (Goat's Horn Cactus)
small, up to 10 inches tall, 4 inches wide, round cactus with white speckles and spines, yellow blossoms with red center - Astrophytum caput-medusae
short, cylindrical, no ribs, tubercles are fingerlike, hairy scales, yellow blooms, uncommon in cultivation, endangered - Astrophytum coahuilense
similar to Bishop's cap, 5 ribs, softer, gray flecks, yellow blooms with red center, fruit red to olive-green - Astrophytum myriostigma (Bishop's Cap Cactus)
green, star-shaped, dome-like, stems globular to cylindrical, spineless, 3 to 7 ribs, white to yellow blooms - Astrophytum myriostigma cv. Hakujo Fukuryu
additional ribs with irregular growths or "warts" on the ribs and between the ribs - Astrophytum myriostigma 'Onzuka'
solitary stem, globular to short cylinder, green with white spots, - Astrophytum ornatum (Monk's Hood)
largest, up to 6 ft.,1 ft wide, globular to columnar, star-shape, white cross bands of scales , spines, white to yellow blooms
- Astrophytum asterias cv. Superkabuto
- Astrophytum asterias cv. Superkabuto, Astrophytum asterias 'Kikko', Astrophytum asterias (Sand Dollar Cactus), Astrophytum capricorne (Goat's Horn Cactus), Astrophytum caput-medusae, Astrophytum coahuilense, Astrophytum myriostigma (Bishop's Cap Cactus), Astrophytum myriostigma cv. Hakujo Fukuryu, Astrophytum myriostigma 'Onzuka', Astrophytum ornatum (Monk's Hood)
- Tags:
- Cultivars / Varieties:
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- Astrophytum asterias cv. Superkabuto
button shape, fuzzy texture with extensive white spots on the the surface, yellow bloom with red center - Astrophytum asterias 'Kikko'
round, hexagon shaped areoles with white dots - Astrophytum asterias (Sand Dollar Cactus)
short, stubby, 2. 5 inches tall, 6 inches wide, globe-shape, 8 ribs that dotted with white tufts, yellow blooms/orange center - Astrophytum capricorne (Goat's Horn Cactus)
small, up to 10 inches tall, 4 inches wide, round cactus with white speckles and spines, yellow blossoms with red center - Astrophytum caput-medusae
short, cylindrical, no ribs, tubercles are fingerlike, hairy scales, yellow blooms, uncommon in cultivation, endangered - Astrophytum coahuilense
similar to Bishop's cap, 5 ribs, softer, gray flecks, yellow blooms with red center, fruit red to olive-green - Astrophytum myriostigma (Bishop's Cap Cactus)
green, star-shaped, dome-like, stems globular to cylindrical, spineless, 3 to 7 ribs, white to yellow blooms - Astrophytum myriostigma cv. Hakujo Fukuryu
additional ribs with irregular growths or "warts" on the ribs and between the ribs - Astrophytum myriostigma 'Onzuka'
solitary stem, globular to short cylinder, green with white spots, - Astrophytum ornatum (Monk's Hood)
largest, up to 6 ft.,1 ft wide, globular to columnar, star-shape, white cross bands of scales , spines, white to yellow blooms
- Astrophytum asterias cv. Superkabuto
- Astrophytum asterias cv. Superkabuto, Astrophytum asterias 'Kikko', Astrophytum asterias (Sand Dollar Cactus), Astrophytum capricorne (Goat's Horn Cactus), Astrophytum caput-medusae, Astrophytum coahuilense, Astrophytum myriostigma (Bishop's Cap Cactus), Astrophytum myriostigma cv. Hakujo Fukuryu, Astrophytum myriostigma 'Onzuka', Astrophytum ornatum (Monk's Hood)
- Tags:
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Attributes:
- Genus:
- Astrophytum
- Family:
- Cactaceae
- Life Cycle:
- Perennial
- Recommended Propagation Strategy:
- Seed
- Country Or Region Of Origin:
- South Texas to Mexico
- Distribution:
- Mexico Gulf, Mexico Northeast, and United States--Texas
- Wildlife Value:
- Bees are attracted to the flowers, and small mammals eat the fruits and disperse the seeds.
- Play Value:
- Attractive Flowers
- Easy to Grow
- Wildlife Food Source
- Dimensions:
- Height: 0 ft. 1 in. - 6 ft. 0 in.
- Width: 0 ft. 2 in. - 1 ft. 0 in.
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Whole Plant Traits:
- Plant Type:
- Houseplant
- Native Plant
- Perennial
- Succulent
- Habit/Form:
- Columnar
- Erect
- Rounded
- Growth Rate:
- Slow
- Maintenance:
- Low
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Cultural Conditions:
- Light:
- Full sun (6 or more hours of direct sunlight a day)
- Soil Texture:
- Loam (Silt)
- Sand
- Shallow Rocky
- Soil pH:
- Acid (<6.0)
- Soil Drainage:
- Good Drainage
- Occasionally Dry
- Available Space To Plant:
- Less than 12 inches
- USDA Plant Hardiness Zone:
- 9a, 9b, 10a, 10b, 11a, 11b
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Fruit:
- Fruit Color:
- Gray/Silver
- Green
- Pink
- Red/Burgundy
- Display/Harvest Time:
- Summer
- Fruit Type:
- Berry
- Fruit Description:
- After flowering, berries are produced and may be gray, pink, or red. They are covered with wooly hair.
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Flowers:
- Flower Color:
- Gold/Yellow
- Orange
- Red/Burgundy
- White
- Flower Value To Gardener:
- Showy
- Flower Bloom Time:
- Summer
- Flower Shape:
- Funnel
- Flower Petals:
- 7 - 20 petals/rays
- Flower Size:
- 1-3 inches
- Flower Description:
- The flower are funnel-shaped, 3 inches across, and have many petals. The color ranged from white to yellow with orange or red centers and occur at the top of the stem.
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Stem:
- Stem Color:
- Brown/Copper
- Gray/Silver
- Green
- Stem Is Aromatic:
- No
- Stem Description:
- The stems are rounded or cylindrical, green to grayish-brown, ribbed, and may have tiny white dots and fine white hairs. Some species have spines and others are spineless.
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Landscape:
- Landscape Location:
- Container
- Houseplants
- Patio
- Landscape Theme:
- Drought Tolerant Garden
- Rock Garden
- Design Feature:
- Accent
- Attracts:
- Bees
- Small Mammals
- Resistance To Challenges:
- Deer
- Drought
- Dry Soil
- Rabbits
- Problems:
- Spines/Thorns