PURPOSE: A microorganism complex containing fungi, yeasts, molds, lactobacilli is cultured in a medium of enzyme solution extracts from wild plants to get good symbiotic relations.

CONSTITUTION: Wild plants, vegetables such as asparagus, fruits such as pineapple are cut into pieces, dipped in high-concentration solution of sugar or the like to effect extraction whereby enzyme solution is obtained. Then, the cocultivation of microorganism complex containing a variety of microorganisms such as fungi, yeasts, molds or lactobacilli is effected using the enzyme solution as a culture medium.

EFFECT: The action of microorganisms is effectively realized on plants, especially on crops.