Mammillaria wrightii Engelm. Plants usually unbranched. Roots: upper portion of primary root somewhat thickened and succulent proximally, otherwise fibrous. Stems flat-topped or spheric, 4-8 à 4-8 cm, ± flaccid; tubercles 6-24 mm; axils appearing naked; cortex and pith mucilaginous; latex absent.
From spring to fall, water deeply and wait for the soil to dry out before watering again. Never let the pots sit in water. Suspend
Mammillarias appreciate intense light, but many species dislike direct summer sun for too long. Plant them in an area of your garden that receives 4 hours of direct sunlight a day. If you are growing your
during the growing season. The fertilizer will help them to thrive and bloom. Apply a water-soluble fertilizer for cacti and other succulents. A houseplant fertilizer higher in phosphorus than nitrogen, such as a 5-10-5 solution, can also be used. Suspend feeding during the winter when
Mammillarias require a soil mix that provides root aeration and good drainage, whether grown outdoors or indoors. Use commercial cactus potting mixes or grit such as coarse sand, pumice, or perlite.
Mammillarias are heat tolerant, but they are not cold-hardy plants. They thrive with temperatures between 70 and 80 °F (21 and 27 °C). In the winter, when
