Mammillaria plumosa is rare cactus original from Nuevo Leon, Mexico.The plant is commonly referred to as Feather Cactus because of its soft and unique appearance. It’s completely covered in white, downy spines. Flowers are creamy-white, greenish-yellow, or dull pink and appear in late summer. These blossoms are very strongly and sweetly scented The desert Mammillaria plumosa feather cactus needs a great deal of bright, direct light. If you’re keeping your cactus as a houseplant, place it in a southern or western facing window. Use a sharp well draining soil, and allow all excess water to run off every time you water.