Mark,

It's hard to see the insect, though I appreciate that you did you best you could with the photo. This is spongy moth season, when the new caterpillars are hatching, and that is my best guess on the identity of these insects. Spongy moths are a serious pest that attack tree leaves but do not usually permanently harm the plant. In any case, I'd try to be sure they don't spread, and frankly, I'd isolate the plants and return them to Lowe's asap.

BTW, what kind of plants are these?

I'm sorry not to be able to be more definitive for you, but I hope this helps.

Richard

Master Gardener Volunteer