alternatives to pesticides - weeds - Quackgrass
Quackgrass forms dense spreading mats with white, fleshy roots.
Keep pulling it out. Pieces of root left in the soil can sprout new growth. Sift the soil carefully to make sure you remove all root pieces. Try covering it with weed barrier cloth. If mowed regularly, quackgrass does not seriously detract from the appearance of a lawn. Mowing will gradually cause quackgrass to decline.
Least-toxic chemical control
Try spot treating with boiling water. If the grass still persists, do not spray. Paint the leaves when they are about 8” high with the least-toxic systemic herbicide available when the plant is actively feeding its roots. A systemic will move from the leaves through the plant’s vascular system and kill the roots. Do not put plant parts that have been treated with herbicides into your compost pile