 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.Unlike the notable ideas (concerning the success of invasive non-indigenous organisms) that preceded it, such as the enemy release hypothesis (ERH) and Charles Darwin's Habituation Hypothesis, the EICA hypothesis postulates that an invasive species is "not" as fit (in its introduced habitat) at its moment of introduction as it is at the time that it is considered invasive.