If you have growing plants that arent flowering, just putting up leaves, but no flowers of fruit, that could be too much nitrogen. If you have plants that are leggy and too tall and spindly, thats probably not enough sun.
But if they are just doing absolutely nothing in zone 5 in full sun, that's soil temperature, IME
Cold feet can stunt a plant and take a good amount of time to recover.
Buy new plants or Be patient.
