GROW MEDIUM - SOIL

5 gallon buckets with many holes drilled in bottom. 2" of river rock line the bottom of the buckets. On top of the river rock there is a home-made mix of soil. This is what the soil is:

60% Happy Frog Organic Potting Mix
15% Perlite
10% Building Sand
10% Worm Castings
5% Happy Frog All-Purpose 5-5-5 Pre-Mix Organic Fertilizer