Lythrum salicaria
Blossey and Nötzold tested their hypothesis on "Lythrum salicaria" (purple loosetrife) by potting seeds from plants growing in Ithaca, New York, U.S.A., and Lucelle, Switzerland. The seeds were allowed to germinate in a lab at Christian-Albrechts University in Kiel, northern Germany, and observed for two years. True to the predictions of the EICA Hypothesis, the plants derived from Ithaca produced significantly more biomass that the plants derived from Lucelle. The "Lythrum salicaria" plants derived from Ithaca also grew taller and were significantly less resistant to the root-feeding weevil present over its native range.