Organic Pest Deterrent?

take 1kg of Stinging Nettle on 10liter of water keep this in a sealed container or jerrycan for a week. Then when u open it there is this super fermented/rotten smell. Remove all nettles and fill a bottle spray can with 1part of this solution and add again 10 parts of water. Use this to spray your plants. Works great and adds some nitrogen aswell! Just dont forget that for foliar spray u really have to have that water added( 1kg nettles to 100 liter of water in the end). Otherwise u can burn the foliage.