Answer: About the only thing those plants have in common are their their smooth leaves (tomato leaves are hairy) so I wonder of your garden has a populaton of snails or slugs? Or, caterpillars can make quick work of a plant. Inspect the leaves to look for shiny trails (snails) or frass (bug poop) from caterpillars. You can use an iron based snail bait such as Sluggo or the botanical Bt (Dipel or Thuricide) to control caterpillars. Hope this information helps.
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