In reply to Phijinator:
There are loads of ways to clear nettles but it depends on where you are:
1) Thick trousers, heavy boots and a bit of trampling.
2) Introduce grazing animals
3) A scythe
4) Get really drunk, push a mate in and then shout "bundle"
5) A brush cutter
6) Glyphosate
7) Use your bouldering mat to push through them and then flatten them.
8) Introduce bind weed, wait 3 moths and then pull the whole lot out in one go.