Pack Size: 20, 100, 300
Year: 2026
Accepted Scientific Name: Mammillaria glassii R.A.Foster
Synonym: Mammillaria glassii subsp. nominis-dulcis (A.B.Lau) U.Guzmán
Alternative Classification: Mammillaria glassii var. nominis-dulcis A.B.Lau
Origin and Habitat:
Mammillaria glassii subsp. nominis-dulcis originates from northeastern Mexico, within the mountainous regions associated with the Sierra Madre Oriental. Plants inhabit rocky slopes and exposed limestone environments, often growing in narrow soil pockets among rocks and sparse vegetation. These locations experience warm days, cool nights, and seasonal rainfall, with periods of limited moisture. The plants are adapted to excellent drainage and develop dense coverings of fine spines that help protect their compact stems.
Description:
Mammillaria glassii subsp. nominis-dulcis is a small, freely clustering cactus forming rounded to short cylindrical stems approximately 1–4" tall and 1–2" in diameter. Numerous fine, white, hair-like radial spines create a soft, silvery appearance, while a few slightly stronger central spines may be present. The plants gradually form attractive cushions of closely packed stems. Compared with typical Mammillaria glassii, this form is especially valued for its relatively large, pale pink to creamy-pink flowers, which appear near the stem crowns during spring.
Cultivation:
Zone: 9–11; protect from prolonged frost.
Temperature: Optimal growth at 18–26 °C. Maintain winter temperatures above 5 °C.
Growth Rate: Slow to moderate, gradually forming dense clusters.
Soil: A fast-draining mineral mixture containing pumice, fine gravel, and limited organic matter.
Watering: Water moderately during active growth, allowing the medium to dry between waterings. Reduce watering substantially during winter.
Fertilizing: Apply diluted cactus fertilizer every 2–3 weeks during active growth.
Light: Bright filtered sunlight to gentle morning sun.
Pests and Diseases: Mealybugs, root mealybugs, spider mites, and moisture-related root rot.
Germination Info:
Temperature: 27 °C.
Surface Sown: Yes. Press seeds lightly onto a fine growing medium.
Germination Time: Approximately 7–28 days.
Moisture: Maintain consistent moisture without saturation.
Light: Bright, indirect light.
After Germination: Gradually increase ventilation and maintain moderate moisture while roots establish.
