Hi!

I have a fairly new spearmint plant. It's on a north balconey and gets 3-4 hours of direct sun a day, and good indirect sun the rest of the day. It's been growing well for a week, but for the last few days it has been getting more and more brown/shriveled spots on the sun-facing leaves. There are no bugs. The soil is well-drained, and I don't think I'm overwatering it. Basically, I'm watering it every 2-3 days and letting it get pretty dry in between. What do I do about the brown spots?? I've had this before and it always led to a slow demise of the plant. Help!!