Dyer’s greenweed (Genista tinctoria) is more utilitarian than edible, but you can still eat a few flowers with a vegetable taste of green peas, while it covers itself in gold for a few weeks. This spectacle, with voluntary contribution, will not cost you much in fertilizer since it fixes nitrogen for its growth. It shares it with its neighbors, thus welcoming the most greedy. Useful in poor soil and anywhere where you want to enrich the soil.