heres the scoop... in my front yard I was planning on planting grass, but I was told to wait until it wasn't so hot, so in September I plan on planting the grass... my question is, all that area (maybe a 1/4 acre) is full of weeds up to my knees. Is there a way I can kill all these so they don't stop growing? I thought of the idea of getting a buinch of thick plastic tarp, and laying it over top, so over time the weeds wouldn't get any sun, and die. When it gets closer, I need to pull all them out too... agh. any tips are welcome!