STINKY!!

Off the top of my head I'd guess damage from cold nights or possibly pests.....but can't rule out the possibility of root issues as well. It doesn't really look like a def or lockout to me. Stinky is much better at troubleshooting that kind of thing than I am so she may something completely different but it just looks like direct damage to me.

Lots warmer today.....keep a close eye and see if/how it progresses. Also consider a good fungus spray and/or bug spray as well for outdoor plants.