1st year Comfrey

Planted comfrey last Autumn and it's just starting to flower.

Should I take a cut now, or none until next year?

When I do cut,;John's book mentions cut the leaves 6 inches from ground. I assume you just cut the stem and not just the leaves?

I do have Nettle tea on the go anyway in an old dustbin.  Other plotholders  asked me why was I trimming the site's huge patch? Received some strange looks when I said it makes a good feed. 

Knowledge is king. lol