On all of them they bloom and then nothing. I deadhead them only to have one of them have a few scattered blooms. I didn't even dare deadhead my blue hill because at least I have a few on there now. My Caradonna is terrible. I am posting pictures for some help hopefully. I don't see any bugs on this particular one, only white fly on my pineapple sages which I seem to have gotten under control. I'm thinking maybe slugs but I don't see them on this one, but do on some of my other plants. I am not sure why the foliage is turning black/purple either. I love these plants but don't know why they do not like me. Please help.

Here is my caradonna

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And a close up of one of the leaves

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Thanks for any input.