Mammillaria scheinvariana R.Ortega & C.E.Glass
Accepted Scientific Name
Mammillaria crinita subsp. scheinvariana
This cactus is native to Mexico (Queretaro). Unfortunately, all the known sites for the plant are submerged by the Zimapan Dam. Since other populations are not discovered, it is considered extinct in the wild. Some authors consider it deserves recognition as a distinct species, but it is usually treated as a synonym or subspecies of Mammillaria crinita.
Mammillaria scheinvariana, also known as Mammillaria crinita subsp. scheinvariana, is a small cactus that forms clumps of spherical to short cylindrical stem with numerous hairlike radial spines, giving it a woolly appearance. The stems are up to 1.4 inches (3.5 cm) tall and 2 inches (5 cm) in diameter. The central spines are not usually present but, if so, are up to 0.6 inches (1.5 cm) long and never hooked. Flowers are funnel-shaped, white to salmon pink, and appear in spring, usually in a ring near the apex of the stem.
The specific epithet "scheinvariana (shin-var-ee-uh-AY-nuh)" honors Léia Akcelrad Lerner de Scheinvar (born 1954), a Brazilian-Mexican botanist that has dedicated her work to studying and protecting Mexico's cacti.
How to Grow and Care for Mammillaria scheinvariana
Light: Plant this cactus in an area of your garden that receives 4 hours of direct sunlight a day. If you are growing M. scheinvariana indoors, place it near the brightest window in your home or office to ensure your cactus gets enough light. If possible, place the pot on the balcony or in the garden for extra light from spring to fall.
Soil: M. scheinvariana requires a soil mix that provides root aeration and good drainage, whether grown outdoors or indoors. Use a commercial cactus potting mix or create your own.
Temperature: This cactus is heat tolerant, but it is not a cold-hardy plant. M. scheinvariana can withstand temperatures as low as 25 °F (-3.9 °C). USDA Plant Hardiness Zones 9b to 11b, 25 to 50 °F (-3.9 to 10 °C).
Watering: From spring to fall, water deeply and wait for the soil to dry out before watering again. Never let the pot sit in water. Suspend watering in the winter.
Fertilizing: M. scheinvariana can benefit from fertilization during the growing season. Apply a water-soluble fertilizer for cacti and other succulents. Suspend feeding during the winter when the plant goes dormant.
Repotting: Repot every two or three years into a slightly larger pot. The best time to repot your M. scheinvariana is late winter or early spring, but the repotting process can be done almost any time of the year.
Propagation: There are two easy ways to propagate M. scheinvariana: by seeds or by dividing offsets. The best time to remove offsets is in spring and summer. Sow the seeds in late spring or summer.
Learn more at How to Grow and Care for Mammillaria.
Toxicity of Mammillaria scheinvariana
M. scheinvariana is considered non-toxic to both humans and pets.
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