Hey all. We sowed our grass seed on new lawns about 4 weeks ago. The problem is alot of weeds came up (dog leaves, and also one with 3 leaves with a black circle in the middle of each one?) The grass is sparse enough but I cut it this evening with the bag off and it looks alot better. I need to spray something to kill the weeds but that wont damage the grass, or laurel and red robin hedging at the back. Anyone recommend anything? I also need to soe more grass seed in the bare patches. Which should I do first? All help appreciated.