I used granular Dimension herbicide and spread it this past Saturday afternoon. It's been a long, cold winter, so I feel like the timing is right. We had some light snow last night and today, perhaps 3/4's of an inch total and most has already melted. Is this sufficient watering or should I get out the sprinklers? We're in line to get an inch of rain later this week. Would it be ok to let the herbicide sit that long? Thoughts?