Need to repot a plant in a planter with no drainage hole? The Sill’s Organic Potting Mix + Lava Rocks kit is here for all your potting needs. It includes one all natural 4.5 quarts (unsettled) bag of each. Potting mix can be used to pot 2-3 small 4" plants, with leftover lava rocks for another planter or two. Potting mix ingredients: compost, pine bark, coir, worm castings, perlite. Lava rocks ingredients: just lava rocks.