For best results, make a second application in the late fall before tilling or turning under plant stubble. Indoor and Patio Container Grown Plants: Apply 1 tsp. for 9"" or smaller pots 1 Tbs.or 12"" or larger post. Incorporate in top 1""- 2"" of soil. Mixing Compost: ½ cup ¼ lb. per cubic foot.