Let me start by saying that I am a brand new gardener as of this year and have been completely hooked. I grow all of my plants in a huge south-facing window of my apartment on the 35th floor of my building.

My brother gave me some beans to plant and I have to say that they might be my favorite of all the plants I have going, partially because they change and move so much (they're really fun to watch develop). Anyways, this past week the growth has started slowing down, and the leaves have been curling and developing these spots:

Anyone know what this is and what I should do about it? Thanks in advance!