Paphiopedilum callosum are native to Cambodia, Laos, Malaya, Myanmar, Thailand and Vietnam. Paphiopedilum callosum species are terrestrial in nature, growing among humus layers under the shaded and moist condition of the tropical forest floor. They are originating in evergreen broad-leafed forests in the lowlands or in cloud forests in the highlands, altitudes from 300 to 2000m (1000-6500 feet). The plants grow in stages. As new growths mature, older growths will slowly die off. A new growth will bloom when it is fully mature, producing a raceme (bloom spike) between the stiff fleshy leaves. Blooms with heavy substance can often last several months.