The functional properties of the invasive Heracleum sosnowskyi were compared with those of the native Heracleum sibiricum. The leaf and root traits, as well as those of a whole plant and of the mycorrhiza formation, were studied. H. sosnowskyi can fulfill the high-productivity potential only under the optimum availability of resources (especially water), while it is poorly adapted to maintain a high physiological activity under the unfavorable soil conditions. An important component of the H. sosnowskyi invasiveness is an ability to utilize rapidly resources in both the above- and underground areas at the optimum conditions.
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