Catherine, I see a lot of mulch in your second pic. Just wondering did you change mulch last year?
I have heard people say that certain mulch have killed their otherwise healthy plants. They are putting toxic dye in the mulch or there are insects in some.
I only use a little mulch in my front flower gardens and I try to catch the expensive cypress stuff on sale because we have termites in our area and they love wood mulch. Most of my gardens get leaves and pine or cypress mulch but most of my gardens I try to use a plant ground cover.