Posted: 31/07/2015 at 19:29
Are you letting the compost dry out between waterings? Those plants shouldn't need watering until the soil an inch below the surface is really dry.
Also none of those need feeding very much. When they were put in those containers the compost should have contained enough feed to last for at least six weeks. Then perhaps a dose of general seaweed based fertiliser in the summer would have been all I'd have given them until next spring.
I think that a combination of over-watering and over feeding has resulted in an imbalance of nutrients in those pots.