comfrey fertiliser

Depends on if you buy in plants or seeds or are using cuttings taken from established plants.

If you are growing from seed, I would imagine you would be waiting three years for it really to establish.  You can harvest the plants lightly, but want the plants to bulk up before harvesting it too heavily.

If you are using bought in plants or cuttings, you will have to wait for the second year before really harvesting heavily.

I put some cuttings in last year, so I expect to be able to make possible one harvest this year then leave the plant to build up resources for next year when I will probably give it two cut backs.

My Local Garden Centre had never heard of it - looks like I may have to try ebay

Bocking 14's are from the Organic Garden Catalogue. 

try thompson morgan . 5 plants for 9 quid. delivered march

As suggested I've ordered some from fleabay, for a plot 15m x 5m what area and how many plant would you give to it?

thanks surbie 100. just sent to fleabay for some. saved me a few bob.