Timing is everything – especially when it comes to pre-emergent. These products work by addressing the weeds in the ground before they even have a chance to germinate. This is why it’s so important to apply them at the right time. If the plants have already germinated the pre-emergent will not work. Your 3rd pre-emergent application should be made at the end of August/first of September. If you get too late into September you’ve missed the window of effectiveness.
Hi-Yield’s Turf & Ornament Weed & Grass Stopper with Dimension will control cool-season grassy weeds – most notably poa annua. Fertilome’s Broadleaf Weed Control with Gallery will prevent clover, dandelion, henbit & other broadleafed cool-season weeds.
Both products should be spread with a broadcast spreader and watered in. You can apply both products the same day, but you’ll want to do them sequentially, not mixed together.
For more information about controlling specific weeds check out our Weed Finder Tool.