I moved into a house that had an old elevated flower bed in the front yard. It had become overgrown and had various types of big tall grasses, flowers, shrubs, and plants in it. I paid someone to pull out most of it, but then spent several hours trying to flatten it out and using a pick-axe to loosen up the soil and pull out the biggest and majority of the big root balls I could find. I sowed grass, but in the back of my head I was skeptical. Sure enough, shoots of one of the types of plants are coming up in masse all throughout and I feel like it's going to starve any chance for the grass to get started.
I didn't have a tiller and couldn't plow up the ground to a a depth of a foot or two so I did the best I could at the time. Any ideas?