Gro-Power 7 gram planting tablets (12-8-8) are excellent for feeding all of your bonsai trees. They are a slow release formula that lasts 9 - 12 months. They are completely odor free. The tablets come packaged in 45 count or 200 count jars or a 1250 count box.
A University of California, Riverside study showed that Gro-Power products were the most effective in maintaining turf quality in cases of restricted irrigation
Gro-Power offers some commercial products containing a wide spectrum of endo and ecto mycorrhizae especially designed for planting drought tolerant plants and native plants and grasses. These products include GroPower Plus w/M, GroLife and GroLife Planting Tablets.