30 grams (powdered) Dehydrated Potato Dextrose Agar (PDA) FORMULA: 24% Dried Potato Powder 43% Agar Agar Powder 33% Dextrose Powder 30 grams of PDA is sufficient to create a 750ml solution which will yield 24-27 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.