|I put in a small greenhouse this late winter and started bedding plants and vegetables. My tomatos grew well but were very tall (leggy), so much so that I pinched them back about 6" so they would build heavier stems. Some of my bedding plants also were very leggy, particulary goditia. They grew prone with stems about 12" long. The stem as it came out of the medium was extremely thin and got nice and large the rest of the way along the plant. My question is, leggy is attributed to too much water, heat and or too little light, which is the cause?