Imagine a fictional character. A fictional character that has about 2' x2' to 2.5' x 2' of available space for containers. This imaginary space is 4' x 2' total but has fans. The wall of the shower would be white and all. In this "space" the main character has been using no more than 4 plants, each in 2 gallon containers. The maximum height available to the plants in this fictional story is about 2' to 2.5'. To finish this part of the book the character needs to know if this is enough room for 3 gallon containers and would that be overkill for plants under 3'? Would 2 gallon pots be enough for a 2.5' plant with 4 tops? The space would JUST be enough for the 3 gallons while there is some elbow room with the 2 gallons. any input?