Gardener's Supply Self Watering Container Mix, 20 Qts.
Our field tests prove it: In self-watering planters, this lightweight mix works better than conventional potting soil. Its coarse, airy texture acts like a wick, carrying water from the planter's reservoir to the root system. The result is more vigorous root growth, better aeration and less waterlogging. It's also an ideal mix for standard pots and planters. Contains sphagnum peat, perlite, vermiculite and limestone. 20-quart bag.