When do you put down broadleaf weed control and grass seed in Region 5?

Someone told me to spread the broadleaf weed control and grass seed together whenever the forsynthia blooms. Does this sound correct? We're in Region 5, in Western PA. Thank you!

When do you put down broadleaf weed control and grass seed in Region 5?
Grass seed is best planted in mid-August to mid-September in your area, but Spring is the second best time to plant it. The seed will germinate when the constant soil temperature reaches around 60-degrees. Rather than stick a thermometer in the soil and monitor the temperature, just wait 'til the nighttime temps are in the 50's. That'll be about the right time to seed. Any sooner and the seed will just lay there to be blown away by wind and eaten by birds.


Forget the dry weed control or "weed %26amp; feed" products, unless you have more weeds than grass. It's more effective to use a liquid concentrate broadleaf killer, such as Ortho Weed-B-Gon or Spectracide and spray each weed with a pump-up type sprayer.
Reply:Together?? Well, OK, you can try that. Forsythia bloom is about right for the weed control for broadleaf weeds. It shouldn't affect the grass germination much at all. However, be careful, if you are going for crabgrass control, please no grass seed. The herbicide won't be able to decern between grass seed and crabgrass seed, stopping both.
Reply:Oh boy, check with your county agent or a good garden center. The guy on the radio here in MD says to plant grass seed in the fall--mid August through September, actually. You put down crab grass preventer when the forsythia blooms. You can fertilize your lawn with an organic fertilizer almost any time now, if it isn't frozen or snow covered, especially if you haven't fertilized it for awhile. The radio guy says you should use a liquid weed killer as the weeds appear, but not before the fertilizer. The fertilizer feeds them, too, and the new growth accepts the weed killer better and is more effective.

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