Mammillaria heyderi ssp. hemisphaerica (as M. applanata)
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Native to the USA and Mexico, this Mammillaria grows as a flattened sphere up to 5 cm in height and 10 cm across. Its flowers are pink and green. A hardy plant, it prefers plenty of sunshine and well-draining soil. Water regularly in Summer and keep fairly dry in Winter. Protect from extreme heat and frost.