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I depends on what kind they are
I think they should be fine now
It is definitely not Japanese Knot Weed, but I don't know what it is. Epimedium springs to mind
There are many different sizes of Astilbe, dwarf size as well as the tall ones. I have 6 different ones in a shady area of my garden, they look good every year and they don't take over the garden.
It could be some kind of caterpillar, I'd pinch out the damaged tips, which should remove the pest and encourage your plant to grow side shoots. Otherwise it looks fine
Looks a bit like Akebia quinata
I sowed some pea seeds last week that had been treated with a fungicide, the coating looked pearly pink
Looks like a teasel, do you feed the birds?
Are they in direct sunlight? They just look frazzled to me