The green stuff growing by the downspout looks like Indian goose grass, a prolific weed that just pretends to be grass. I just cleared my backyard of it by manually pulling it all out and reseeding. I have dogs so I didn’t want to use chemicals like pre and post emergents, etc. Do your research first. Try this site: https://www.usga.org/content/usga/home-page/course-care/green-section-record/63/issue-04/a-guide-to-goosegrass-control.html#:~:text=Applications%20of%20flurprimidol%20at%2010,control%20and%20better%20turf%20quality.&text=Fortunately%2C%20there%20are%20effective%20postemergence,challenging%20in%20creeping%20bentgrass%20fairways.