How to use Comfrey as a fertilizer.
Fertilizer 
Comfrey is a dynamic accumulator which extracts the nutrients in the soil and can then be used as a fertilizer. It's root system can grow up to 10 feet down to extract nutrients from places which other plants cannot reach. Other dynamic accumulators include, Borage, Bracken, Clovers, Stinging Nettles, and Yarrow.
To use Comfrey as a fertilizer there are several options. Firstly they can be used straight from the plant as a lining for trenches or as a simple mulch, they can also be mixed with water and used as a liquid manure, or they can be incorporated into other composts. My favorite method is to cut the leaves and place them in a large water butt, with no water. The leaves will break down quickly and produce a black (very smelly) liquid, which can be diluted (15:1) with water and applied to crops.
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