Twin-Spined Cactus (Mammillaria geminispina): A White, Clustering Pincushion

Mammillaria geminispina, known as Twin-Spined Cactus or Whitey, is a charming clustering cactus that forms dense mounds of globular stems. Each tubercle bears a pair of stiff, white central spines (hence "twin-spined") and numerous white radial spines, giving the plant a snowy appearance. In spring, it produces rings of small, carmine-pink flowers. It's a classic, easy-to-grow mammillaria.