Have you mulched them with bark recently or sprayed with anything on them or nearby?

Yes barked, but also sprayed with bug killer. Should i have not????? Novice gardener. First year.

Well, the bark can release a lot of tannin into the soil (depending on the tree bark used) which can lock nutrients up in the soil making it hard for some plants to absorb them. This would manifest over a period of time, not immediately.

Assuming the bug killer was applied at the correct rate (unless a pre-mixed hand spray) it probably won't be this.

Any chance of posting some pictures?

Will post them first thing in the morning!!! And thank you.

No problem. I'll be at work but will endeavour to help later unless anyone else hits proverbial nail on the head :-)