Comfrey (symphytum officinale)
 
Comfrey can be added to the soil as a natural fertilizer. It is easy to grow and can reach heights of 2-3 feet.  It likes a variety of locations, from full sun to shade, and is not particular as to the soil conditions.
Many people worry that comfrey will become invasive and spread.  A lot comfrey does not produce viable seed and stays in place. It will only spread if disturbed.  Every piece of comfrey root has the potential to become a new plant. So any digging or rototilling near comfrey will probably result in new plants.
Comfrey is known for its medicinal properties, often used in balms and salves for healing bruises, sprains, and other skin conditions. It is easy to grow and a great addition to any garden or nursery. Whether you are looking for a natural fertilizer, medicinal herb, or simply a beautiful addition to your garden, comfrey is the perfect choice.