When will comfrey appear?

my comfrey is just starting to show , what i do with mine is cut leaves put in small bin with tap on it ,i put leaves in bin put round piece of wood that ive cut just saller than bin on top of leaves with some bricks on for weight .they rot down and i collect juice ,mix juice 20-1 and feed
plants  very good , and easy to do .dont smell left overs just put in compost bin.