G.Leave
Cultivators Club
very nice, our container is probably about 8 inches tall so not very tall, so the 1 foot theory does hold true.
The point i was trying to make is if a 1foot deep hole(6 feet across though!) can make a plant 8 feet in height with a 30 foot+ circumference, then i believe a mini bonsai plant might be able to go far more shallow, and still have a plenty expansive root base to produce solid flower
Of course this is all theoretical. Maybe i'll try a 4" depth wide container next round and see what happens!