Using nettles

Nettles are often despised, but they are actually very useful in a garden.
If you have nettles near a fruit tree, they'll help your tree be more resistant against parasites.
In a vegetable plot nettles will help cauliflower and tomatoes grow and will add more aroma to mint and other herbs.
You can also chuck nettles on your compost heap which will speed up the fermenting process.