Liquid Fertilizing

Quick question about fertilizing. I was told to dilute my liquid fertilizer by half from what the packaging says when giving to my runner bean seedlings, but now that they're getting bigger I'm wondering at what point should I stop diluting? I suppose you'd say they're at teenager stage right now. Not baby plants but not adults either. Should you only give the full dosage to adult plants as a general rule?

My practice is to start at 1/4 of the manufacturer recommendations and slowly build up from there. My experience has been that the manufacturers often recommend using more of their product than is necessary, and sometimes so  much that it causes problems. If you've got healthy soil your plants will both have access to more inherent soil nutrition and make much more efficient use of any liquid fertilizers

I'm no expert, but it is my understanding that beans don't need much in the way of fertilizing.  If you put down a layer of compost, maybe mix in a little bone meal, and you should be good to go.  A lot easier, and cheaper.  Good luck to you.