Thank you Dutchlady. The idea that the pot may be too small is rather disturbing. The white pot is at LEAST 7.5 gallons, and it weighs a TON even though it is plastic. The other one is only about 4 or 5 gallons, so Yes, that one might be too small. Yes, I have been fertilizing, but I'm perhaps not using the correct types. I use a general fertilizer...a 10-10-10, so do you think that's the problem? I've been a little bit lazy this year, but that's mainly because I used the Miracle Gro potting soil with fertilizer included. I didn't want to kill anything by overdoing it...so perhaps that is the mistake?