100 grams Potato Dextrose Agar (Dehydrated) PDA FORMULA: 24% Dried Potato Powder 43% Agar Agar Powder 33% Dextrose Powder 100 grams of PDA is sufficient to create a 2500ml solution which will yield 80-90 100mm petri dishes Potato dextrose agar is a common microbiological growth media made from potato infusion, and dextrose. Potato dextrose agar (abbreviated "PDA") is the most widely used medium for growing fungi and bacteria which attack living plants or decaying dead plant matter.