both the mint and rucola that the MC is bringing over from his home country and planting in the new world are both invasive species of plant. I know he is trying to help but he's got to do a little more research and use a little more common sense or will end up destroying that worlds natural environment. stories like this start out nice but get annoying to read once he starts bringing over modern day technology over to a medieval level world. if it was only for his personal use then its fine because the damage will be to limited to cause any permanent damage. But once he starts giving technology out to everyone then it gets frustrating.