In fact, many plants that now decorate the North American landscape originally “came as weeds in agricultural crop seeds; others in cereals and grains; in packing materials such as straw and hay; in ship’s ballast...
Hulk taimi, mis praegu Põhja - Ameerika maastikku ehivad, sattusid alguses siia „umbrohuna koos põllutaimede seemnete, teravilja, põhust ja heinast pakkimismaterjali ning laevade ballastiga...