Astrophytum myriostigma

Bishop's Cap Cactus

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Compact star-shaped cactus with white woolly spots. Native to Mexico. Prized for its geometric form and bright flowers.
yard Succulents plants wb_sunny Sun pets Not pet-safe
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Plant Details

Common Name Bishop's Cap Cactus
Family Cactaceae
Genus Astrophytum
Species Myriostigma
Origin Mexico
Blooming Late spring to early summer, yellow flowers emerge from the apex.
Leaf Color Grey-green
Sunlight Sun
Category Succulents plants
Pet Friendly close No
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Care & Maintenance

terrain
Soil

Cactus mix with pumice and perlite for excellent drainage; avoid clay-heavy soils.

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Watering

Water sparingly during growing season, keep completely dry in winter dormancy to prevent rot.

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Sunlight & Care

Requires full sun exposure. Provide afternoon shade in extreme heat to prevent scorching.

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Fertilization

Apply diluted cactus fertilizer once monthly during active growth (Spring/Summer) only.

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Pruning

Remove damaged spines or dead tissue carefully with tongs; do not trim healthy stems.

Pest Control Mealybug Scale Insect Spider Mite

These are the insects and pathogens that commonly interact with this plant, including pests, parasites, and organisms typically associated with its care.

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Seasonal Periods

local_florist Flowering Period 3 months
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
eco Leaf Persistence 12 months
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
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Growing Parameters

thermostat
Temperature
41° – 100°
Fahrenheit
Ideal ambient air temperature range for healthy growth
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Humidity
15% – 70%
% relative
Optimal relative air humidity the plant thrives in
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Light (LUX)
2000 – 60000
Lux
Ambient illuminance level at the plant's surface
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Light (PAR)
100 – 2500
mmol/m²/s
Photosynthetically active radiation (PAR) intensity
water
Soil Moisture
5% – 30%
% volumetric
Water content in the growing medium
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Soil EC
200 – 1500
mS/cm
Electrical conductivity (nutrient concentration in soil water)
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Common Problems

Something wrong with your Astrophytum myriostigma? Select a symptom to diagnose and fix the issue.

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