I hate when these things happen! I struggle to figure a lot of things out, so I'm probably going to be no help. The first plant looks like it's had frost damage, but it's hard to be sure, especially from a photo. The next photo looks like something small has been nibbling the back of the leaf. Then the third, could it be fungal?
One way to check for bugs that never seem to be there is to go out at night with a torch. Many of the critters that feast on plants do so at night.
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Thanks for the tips. 👍
Meanwhile, I found out that it is probably leaf spot disease... a nasty fungus that has survived winter 😭
Argh! Fungal is one of the hardest to treat! Good luck with it and let us know if anything works.
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I'm trying to control it by adding lava rock to the soil and spraying a thin layer on the plants.
Fingers crossed 😉