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Star Cactus Astrophytum

Other plants called Star Cactus:

Previously known as:

  • Digitostigma
  • Maierocactus
Phonetic Spelling
as-tro-FY-tum
Description

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:
  • 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 '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:
#houseplant#drought tolerant#succulent#columnar#small mammals#ornamentals#rounded#cactus#dry soils tolerant#bee friendly#non-toxic for dogs#non-toxic for cats#perennial#full sun#arid#wildlife friendly#container
 
Cultivars / Varieties:
  • 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 '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:
#houseplant#drought tolerant#succulent#columnar#small mammals#ornamentals#rounded#cactus#dry soils tolerant#bee friendly#non-toxic for dogs#non-toxic for cats#perennial#full sun#arid#wildlife friendly#container
  • 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.
  • Whole Plant Traits:
    Plant Type:
    Houseplant
    Native Plant
    Perennial
    Succulent
    Habit/Form:
    Columnar
    Erect
    Rounded
    Growth Rate:
    Slow
    Maintenance:
    Low
  • 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
  • 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.
  • 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.
  • 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.
  • 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