PROBLEM TO BE SOLVED: To provide a compound that is useful as an active constituent in an advantitious root formation promotor for promoting the formation of roots by a plant and improving the rooting rate thereof, and to provide a rooting method and a rooting medium for improving the production of clone seedlings, particularly clone seedlings of plant species that exhibit a poor rooting ability, by means of cutting and tissue culture methods, while employing the advantitious root formation promotor containing the active constituent.SOLUTION: This invention relates to an adventitious root formation promotor for apamin-containing plants, a medium for rooting of plant shoots containing the adventitious root promotor, and a method for producing clone seedlings using the adventitious root promotor or the rooting medium.
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