Comfrey

SOME of the best things in life are free - including plant food made from comfrey.

There's a good article in the latest Guardian on how to make great liquid plant food from this versatile plant.

While comfrey dies down in winter, it's very hardy and will grow in pots too.
I planted some near the compost bins so i can pull of a few leaves each time I add some material to the mixture.
These leaves seem to help break down the compost more quickly.