bought 2 tomato plants, they were in biodegradable pots. I was able to plant one in a large container but then we have had 3 days of rain, the other one is still in the small biodegradable container. The one in the large container is fine, the one in the bio-pot is the one with brown spots. I have the bio-pot in a bowl to keep the roots from drying out so it might have been in some water the last few days. The weather has been chilly but not too cold (about 45 to 55F at night and 65 to 70F in the day) ... any ideas?