Posted: 12/09/2017 at 21:54
I grow comfrey bocking 14 (which is not invasive) and and take about half the growth off every 3 weeks or so from late April until end Oct.
I chop the leaves up (just roughly with shears) and stuff into buckets with some of that rigid clematis support net I've shaped to fit the buckets, and a brick on top to squash it all down. I then add water up to the bottom of the brick. I put a lid on each of the buckets (it pongs a bit!!). It's ready after 3 weeks, and I strain it (old tights are useful) into old car wash containers.The sludge left after straining goes in the compost heaps .... it's a good activator.
I dilute about 20:1 to feed most flowering things during the growing season.
Each spring I make sure to give the comfrey plants plenty of well rotted manure to get them off to a good start.
Seems to work OK ... cheaper than tom. feed.