Do I need to feed my su flowers please. About 4 inches high at the moment
Not yet. If you’re potting them on regularly the fertiliser in compost should last for six weeks.
I would wait until they’re planted in the ground after the frosts are over .., then I’d feed the bed with Fish, Blood & Bone or Growmore or similar balanced fertiliser.
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.