I recently transplanted some mint from my mother's garden in chicago to a pot in ann arbor. the mint is starting to go from a dark green to a light green. When i transplanted, i took some and planted it in a clear and shady area in a forest near my home as well. The forest-planted mint is still nice and dark but the container mint is getting lighter by the day. The planter is well drained. Filled the bottom with foam packing material, then some potting soil around the transplants. I gave the pots Miracle grow twice in three weeks. My balcony gets a lot of sun.
I think it might be too much sun or possibly too much fertilizer. Any thoughts?