Name: Sandy B. Ford River Twp, Michigan UP (Zone 4b) (Zone 4b-maybe 5a)
Greg, did you just recently plant that out in the planter, as a started plant? It looks like sunburn to me, which could be from the plant not having been acclimated gradually to the sunny spot, or maybe the sun in that spot is just too harsh.
“Think occasionally of the suffering of which you spare yourself the sight." ~ Albert Schweitzer C/F temp conversion