Help! We just dethatched, rolled, seeded and watered and this is what are lawn looks like. We can't spray because we have put new seed down. We have resulted to pulling it out by hand which has cost several hours of labour. Can't seem to find what this is. It has small purple flowers, and skinny leaves, and spreads like wildfire! Any ideas as to what it its and how to control it (in Canada, where we can't use many pesticides) would be greatly appreciated.