I learned my lesson on planting grass seeds

[Merkava_4]

The lesson learned is don't put too much seed down in one area. If you do, the grass grows up
into a mess of dense fine strands that look more like moss than grass. The grass strands are
too week to stand up on their own; so then they just fall over and prevent the water from
getting to their own roots. The closest way I can describe it to you is if you've ever seen
soggy alfalfa sprouts, they look similar to that. However,the grass seed that I planted
more sparingly over a larger area, grew up into strong healthy blades.

[mdlwn1]

It's called "damping off" They are too crowded and basically rot.