quack grasses造句

• The ones that do are usually less-desirable, non-native ones such as quack grass, which needs high doses of nitrogen to thrive.
• A word of warning : If you do have a mat of perennial weeds ( made up of quack grass, for instance ) it will resist breaking down.
• _As nitrogen rises, the number of plant species declines; the thick green grass, a species called quack grass, which happens to proliferate wildly in high-nitrogen soil, has crowded out other species in its plot.
• His pick for worst garden weed is quack grass ( Agropyron repens ), " because it has these underground runners and you can pull up the weed or, if you're hoeing, you always leave fragments behind, and you never seem to get rid of them ."