We have 3 different tomato plant varieties, each 1 in about a 10 gal plastic pot each. Various issues include self decapitating blooms on 2, yellowing leaves, and tops of 1 that are dying off. I also am noticing 2 plants' leaves are starting to gray & not sure if it's a prilim problem starting. Watering about half gallon each morning & getting sun for easily 6-8 hrs /day. Currently on concrete in roll-around bases with gravel in the bottom tray to help drainage. I have pictures but cannot see how to attach/include them.