u/Green-Notebook_32

Hi everyone, our top soil was piled up on site to make way for our build. It's now time to spread the top soil to finish the garden and grow some grass. Our contractor has asked us to spray some weed killer to kill the weeds for work in 2 weeks time. Is there another method to kill the weeds besides using weed killer? We have quite a few of them, the site is just over half an acre.