before I can answer the question I need to know what plants and how big are the pots please

This is about honeyberries, I believe. If you're growing in compost in pots, the compost itself has nutrients present, enough for six weeks of growing. After that, it'll be coming on for autumn, so no nutrients needed this year. Next spring, I'd be inclined to either use a handful of Growmore stirred into the compost, or Miracle Gro general purpose (the blue powder in a box one) watered on according to the instructions on the box, probably from end of March.