grindelia squarrosa, ambrosia artemisiifolia, cirsium arvense, melilotus albus, achillea millefolium, artemisia absinthium, cichorium intybus, convolvulus arvensis, erigeron canadensis, galium aparine, jacobaea erucifolia, lactuca serriola, lappula marginata, melilotus officinalis, poa angustifolia, carduus acanthoides, daucus carota, pilosella echioides