You might want to do that right before your preemergence application, otherwise you will probably disturb the soil brier.I don't have a good solution, so I am interested to see what others might have. I usually use my blowers and round them up into piles and then pick them up to remove them. I do have a new stihl mini tiller with a de-thatcher attachment. I think if I used it by pulling it backwards it might 'rake' them up. I'll have to give that a try. We had a lot of wind this weekend so I know I have a few customers that I can try it out on.