Quote:
Originally Posted by genuinegirly
your clay soil is severely nutrient-poor and once your fertilizer was used up, the plants were left starving.
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Genuinegirly has just identified your problem. There is not anything in clay to keep plants alive. You needed to spread some topsoil before planting. Since you did not, you may be able to spread some fertilizer, water it in, then lay down a layer of compost over the grass. Do not use a fertilizer with weed killer. Right now, you need anything that can to get a roothold. You can take care of the weeds in a couple of years. Right now, they are your friends. You need to build up a layer of soil. This is acheived through decaying matter. Leaves, I find, break down the quickest. It may also help to lay down a layer of straw to help hold some moisture on top to aid in the decaying process.