The report (link below) was written by a government agency with assistance from Nanjing Forestry University.  The report did not specify an exact increase in yield, however, it stated, “all parameters related to plant growth vigor increased by more than 25% as compared with those of untreated tea trees” and SumaGrow “produces positive effect on the soil.”

The height, width, number of buds and size of buds all increased by at least 25%, leading us to conclude that the average yield increase was over 80% (see link to report below).

The tea leaves (right) appeared shiny after treatment with SumaGrow.