Comfrey and nettles: liquid feeds

Comfrey is an important plant in organic gardening because its leaves can be used to produce a very good potassium-rich liquid feed. This is the best feed for all fruit plants and particularly for tomatoes and the good news is that it is really easy to do and free. I have seen quite a few recipes for comfrey feed: here is one. It does not include water, which is weird, maybe they forgot? It seems that everyone does it slightly differently. If you do not want to bother producing liquid fertilizer, you can simply use the leaves in your compost or directly in the soil as mulch for tomatoes (it will take more time to act than in liquid form, that is all).

Comfrey's secret is that its root is extremely long and reaches down the soil to where most other plants cannot reach. Then it brings the nutrients it has found deep down to its leaves. There is a sole disadvantage to it. Once it settles, it is extremely difficult to get rid of comfrey. So be very careful not to let it spread. To avoid it there are two possibilities, get a sterile variety or else do not let your plant produce seed by cutting off flowers.

Nettles can be used in the same way as comfrey, that is following the exact same recipe in order to obtain a liquid feed, but beware, this feed is rich in nitrogen and hence good for leaf growth, not fruit and flowers. Here is another video.