Astrophytum myriostigma
Bishop's Cap Cactus
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Bishop's Cap Cactus (Astrophytum myriostigma) - Description
Astrophytum myriostigma (common names: Bishop's Cap Cactus, Bishop's Hat or Bishop's Miter Cactus) is a species of cactus native to the highlands of northeastern and central Mexico. Synonyms include Echinocactusmyriostigma, Astrophytum prismaticum, A. columnare, A. coahuilense, A. tulense, and A. nuda. A. myriostigma is a spineless cactus defined by the presence of three to seven (usually five) pronounced vertical ribs which define the cactus' shape when young (the genus name "astrophytum", literally, "star plant", is derived from the resulting star-like shape).
Bishop's Cap Cactus (Astrophytum myriostigma) - Blooming
Large flowers are borne in spring and summer. The flowers are diurnal. Blooms are followed by ovoid, green or red berries.
Bishop's Cap Cactus (Astrophytum myriostigma) - Growth
Slow-growing cacti. Grows best with full sun exposure. Where temperatures drop below 50ºF (10ºC), it is best to raise plants indoors in a temperate greenhouse. Elsewhere, Astrophytum works well in a desert garden.
Bishop's Cap Cactus (Astrophytum myriostigma) - Planting
Propagate from the seed in early spring at 70ºF (21ºC).
Bishop's Cap Cactus (Astrophytum myriostigma) - Pest
Prone to aphids, scab, and root rot.
Bishop's Cap Cactus (Astrophytum myriostigma) - Interesting facts
There are only 4-6 known species in the genus Astrophytum, native to dry, arid regions in S. Texas, and N. and C. Mexico. The ovoid berries of Astrophytum contain boat-shaped seeds.
Bishop's Cap Cactus (Astrophytum myriostigma) - Soil and irrigation
Does best in poor, slightly alkaline soil that is sharply draining. Standard cactus potting mix with added limestone chips works fine for indoor plants. Water moderately during the growing season. Keep almost completely dry when dormant.
