Report Is second hand potting mix fine to use? in Sarracenia Posted September 26, 2012 I am not very experienced, but I do not reuse potting soil from plant I bought in garden centres, ebay, and other not reputable sources. Who knows what lives in that soil. I repot them right after purchase, after rinsing plant in water, since my plants sits next to each other and I do not want any pest to spread. Having said so, I feel perfectly comfortable with reusing soil I planted a plant in myself.