To kill a lawn without herbicides takes time, but it can be done. Cover the grass with thick layers of newspaper - at least 8 or 9 layers. Then wet the papers and hold them down with rocks so the paper doesn't blow away. Wait one whole season. Another way that also takes time is to lift squares of sod and turn them upside down. The grass will decompose and eventually, this will become soil. But the important thing is patience. The soil will be fertile, in fact, more fertile than ever. To get rid of annual weeds, you can either smother them with the methods above, or just keep mowing them short, don't let them bloom. No seed, no return.
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