This nettle plant feed has such a simple method and creates a great concentrated tomato-feed. Keep feeding nettles into a jar half filled with water, add more water as needed. The smell of the rotting nettles is mighty and its advised to wear a mask or scarf over your mouth and nose. The nettles rot to create a concentrated sludge. Mix with water in a 5:1 ratio and include every few weeks when feeding your crops.