Are they in cups, pots, beds or ground? Over watering shares signs of nute burns. If they are semi small let the soil dry out good, then water. too much water drowns the roots and then they look unhealthy and signs are similar to nute burns because ur girls aren't able to draw in nutes. They lock out from drowning/dying roots. Best bet let them dry out and water sparingly then let them dry out again and flush with clean clean water. avoid tap water when flushing. If you are in pots pop them out and check out roots. If they are brown you are prob over watering. Feed 1/4 to 11/2 strength. I'm no pro but have had these prob throughout the years and it was usually over watering if ur not feeding too hard. Best of luck.