Comfrey is one of my favourite plants and something that I believe every single gardener should grow. It is an herb which has been grown by gardeners for decades and sometimes known as Knitbone. This name originated from the fact that this plant was used as a remedy to heal bones if they were broken somehow.
Comfrey is a deep rooted plant. Its root system is very extensive in general. Having a deep rooted system, this herb is capable of gaining its required nutrients from deep down the soil. The nutrients collected by the roots of this plant collect in its leaves. When these leaves fall or are cut, the nutrient become easily available to other plants too. This herb is appreciated for the fact that it does not lock Nitrogen. It is also a good source of potassium.
The most commonly grown variety of Comfrey is called as Bocking 14. It is a sterile variety. Being sterile, its growth can be kept under control.
It is planted by taking off sets from the parent plant and planting root cuttings that way. If you want to plant Comfrey, it is important that the plant you have chosen to get the offsets from is very strong and mature. Using a spade, the crown should be removed and split into more pieces. The plant from which this crown is taken will recover soon too. These off sets can be sown and grown into new plants.
Comfrey plant grows in a controlled manner. However, all the offsets prepared can re-root themselves. As a result, when any fragments of the same are to be disposed of, that should be done with care. If there is an uncontrolled growth of Comfrey plant, it is not very easy to control it later on.
In general Comfrey is a plant which prefers to be in complete sunlight. In some cases, it can bear shade too, but sunlight is its natural habitat. Sandy soils are good for this plant. Also, the plant is a strong one so it can adapt in various situations. However it can grow densely and is not easy to weed out. It is thus better to look for probable weed plants and roots before getting into actual planting. Do not cut the plant in first year of its growth. When the plant reaches two feet height, it can be cut down to 2 inches of height.
These leaves can then be used for a mulch or to create a liquid comfrey feed.
Image source: The Vitamin Doctor