nettle "tea" ok to use on celery??

i've made half a barrel of stinky nettle "tea" : stuffed nettles in and covered with water, left it for a month or so.

Is it ok to use this on celery? My celery's looking rather yellow and anaemic, so thought it might need a feed?

if so, how much to dilute it by? I read somewhere that it should be the colour of weak tea...?