Thanks Bob. I agree, spraying the ground generally would be a waste of spray. However, when I say I'll be spraying the ground, I mean the odd patch in between the lawn of weeds; the whole area is green with weeds. Spraying the ground in between ensures that I haven't missed any small emerging ones that are hard to spot.

Thanks for the tip on renting a rake; should save me a bit of money. And the roller will save alot of time, too.