Martins General Purpose Potting Mix 25LAs an expert in the industry, I recommend Martins General Purpose Potting Mix. This high quality potting mix has optimal drainage and ample nutrients for strong and healthy root growth for up to one month. For even better results, add a controlled release fertilizer when potting. It also meets the standards set by AS3743 for Regular Grade Potting Mix and includes a soil wetter for improved water penetration and re wettability for up to six months.