I put out about three or four dozen leek starts from johnnys selected seeds in early may, they took hold, they are still alive, they don't grow but they don't die either, let them stay in the ground till it starts to cool off again maybe they will take off then. Gigantic cauliflowers with no heads whatsoever after about 60 days either. I suspect the heat, even w/ shade cloth. So just let them keep going and maybe they will fruit in the fall, or tear them out and start over? Other stuff looks great. Squash are in full flower, baby lettuces of many variety are divine. Still too early to tell on the rest.
Zone 4B, Maine. Approx. 124 day growing season, 50% frost-free certainty May 14th-Oct 1st. Ten 4'x8'x15" raised beds with PVC hoops attached with lightest weight row cover/bird netting/30% shade cloth, depending.