Sta-Green Premium Container Mix Sta-Green Premium Container Mix with Fertilizer is an excellent mix for potting and repotting indoor and outdoor container plants, flowers, vegetables and herbs. Formulated with high quality Canadian sphagnum peat moss, composted bark fines, and horticultural perlite providing optimal drainage and aeration for strong root development. Sta-Green Premium Container Mix is enriched with Sta-Green timed-release Plant Food that releases nutrients in metered doses to the plant in response to soil temperature, not moisture level like other potting mixes. Sta-Green Premium Container Mix with Fertilizer is available exclusively at Lowe’s in 16 qt and 32 qt sizes.