your plants are in containers and are probably running out of food re pot into larger pots and feed with tomorite as a liquid feed and growmore as a feed in the compost
if you cannot repot remove the top inch or so and replace with a mixture of compost and a slow release fertilizer then water well and feed each time you water with tomorite or a liquid feed
i can o water with a little epsom salts will help as a one off feed
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