Broadleaf weeds such as Dandelions are another problem, although fairly easy to control with a broadleaf weed control. Most broadleaf herbicides are mixed in with the fertilizers, and white metal bearing must be applied when the grass and weeds are damp. The wet foliage will cause the herbicide to stick to the weed, giving the herbicide time to be absorbed by the weed. Once absorbed the herbicide translocates through the weed plant and kills it completely.
These types of herbicides are considered "selective" since they seem to know the difference between a grass plant and a weed. That's why they only kill the broadleaf weeds and not the grass itself. However, many people have different kinds of thick bladed grass in their lawn such as quack grass. Quack grass is on the ugly side, and can really detract from a lawn. The problem is, it is still in the grass family, and "selective" herbicides leave it alone because it is a card carrying member of the grass family.
If you happen to be installing a new lawn, make sure you spray all the weeds and thick bladed grasses before you start. Once you have the lawn installed, you sure don't want to go through all the trouble of killing areas of your lawn and reseeding. If you make sure that all of these undesirables have been killed before you start, you'll be way ahead of the game.
When selecting grass seed, you should always use a blend that is recommended for your area. Here in the north a popular blend contains fine bladed perennial rye grass, fescue, and blue grass. Keep in mind that it takes blue grass seeds 28 days to germinate, while most perennial rye grasses germinate in 5 or 6 days, so you never want to plant a lawn that is 100% Kentucky blue grass. Before the blue grass seeds have a chance to germinate, every kind of weed imaginable will already be actively growing in your lawn.
With a blend, the faster germinating grasses come up quickly, and act as a nurse crop for the slower germinating seeds. Having a blend also gives you some protection in case some new pest comes along that attacks certain types of grasses.
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