Potting Mix amendment for Superior Paphiopedilum Culture Provides slow release calcium and silica for strong, shiny leaves and increased vigour. Gently raises pH to optimal levels. DOSE: Every 3 months sprinkle 1 heaping teaspoon on to the surface of a 2 1/4 inch pot. 2 heaping teaspoons for a 4 to 5 inch pot, or 4 heaping teaspoons for