Comfrey is used as a green manure, its leaves make an excellent liquid feed for plants that is both high in potash and minerals. Great for feeding tomatoes and other plants. Comfrey is a perennial plant that grows rapidly. It has many other uses including use as an activator in compost heaps to speed up decomposition of other plant material. I have a number of plants that I have grown on in 9cm pots at £2.00 each (for collection only in pots) and are surplus to my requirements.