How to make lawn greener?

[tenplay]

We are planning on putting our house on the market in 3-4 weeks. The large lawn needs some work to improve its looks. The front lawn is thick and free of weeds. But even with frequent watering, it is looking brownish-yellow in a few areas. Maybe it needs some fertilizer. If so, what kind would be best?

Our back lawn is green enough. But in areas that we replanted grass a couple of months ago, a lot of weeds (look like small dandelions) have appeared. Is there some type of treatment that would take care of the weeds quickly?

We live in Western Washington near Olympia. The weather has been very mild with highs in the mid-70s and lows in the mid-50's, partially cloudy with only occasional showers. Thanks for any advice.

[Charles]

I'd use ammonium sulfate. Cheap, quick, will give the green color you want. Unless your grass is short of iron, a local nursery should be able to tell you if that's likely.

For the weeds, I'd use a quick acting broadleaf weed killer spray, look for something that promises 24 hour action.

The purists in the group will hate me for giving this advice.

[symplastless]

If you fertilize with magnesium I hear it will create a greener lawn. The center of every chlorophyll is magnesium. Just a thought.

[Sheldon]

Lawn grass should be easy to grow in your climate. Lay down a light top dressing of bagged topsoil and treat with Scotts Turf Builder +2. Mow twice a week with a mulching blade set at 2". Within two weeks you'll have the prettiest lawn in the county.

[dr-solo]

[Kay Lancaster]

What species of grasses do you have?. And is your mower blade sharp?

Hawkweeds. Water well, grab and pull. Overseed.