The kidneys are paired retroperitoneal structures that are normally located between the transverse processes of T12-L3 vertebrae, with the left kidney typically somewhat more superior in position than the right. The upper poles are normally oriented more medially and posteriorly than the lower poles.
Growing Comfrey in Pots. Comfrey will grow in pots (at least 3 gallon), containers such as plastic tubs, or 5-gallon plastic buckets but they do better when not grown in a pot. They have deep roots so prefer growing in the garden where they get more nutrients. The containers need drainage holes in the bottom. Add fertilizer to the potting soil.
It was cultivated in gardens for centuries, its popularity giving rise to myriad common names. Many references were made to comfrey's healing properties in various herbals in the 16th and 17th centuries. Traditionally in Europe, the root and leaf were used in cases of sprains or strains or broken bones. Due to the roots high mucilage content, it was often utilized in the same way as marshmallow root (Althaea officinalis). 2. The root is considered nutritive, cooling, and moist in traditional Chinese medicine (TCM).