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When weeding, the best way to make sure you are removing a weed and not a valuable plant is to pull on it. If it comes out of the ground easily, it is a valuable plant.
Well, as long as the lawn gets enough nitrogen, it should be fine.
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If there are no stupid questions, then what kind of questions do stupid people ask? Do they get smart just in time to ask questions? - Scott Adams
i just use off the shelf stuff, high nitrogen content helps. i need to reseed but hate to throw money out into the yard, grass used to grow just fine on its own, now its seems to be indian...........a bit a-patchy
Brand names cost a ton more and their effectiveness aren't always different. I use cheaper stuff from big box stores and have had the same effect as friends that use Scotts. Depends on your size. If you have a large area, I'd start cheaper.
Keep in mind a fertilizer works best when used according to a program that allows you to fertilize at several specific times throughout the year.
Any lawncare treatment has to be used in the right conditions and at the recommended time in the season. Also take into account local conditions. I don't know of any "out of the box" brands to avoid. You could google to see if anybody has done some comparative tests.