I am sorry for this delayed reply to your gardening question. The spring rush has brought a deluge of questions and we are working hard to catch up!
There are a number of different preemergent herbicides on the market. Each works on a certain group of weeds so it is difficult to generalize. Pre-emergent herbicides pendimethalin and bensulide control germinating annual bluegrass and crabgrass in lawns. They must be applied before the grass germinates.
Thanks for the question. Best wishes for a wonderful gardening season. Please stop in again soon!
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