One of the GREAT things about a Tower Garden is that you can grow Lettuce, even in South Florida, in the Summer. You will not find any other farms or families growing lettuce in the ground in Florida in the Summer. So Why can you do this in a Tower Garden? It’s all down to the 20 gallon reservoir. 20 gallons of water will never get as warm as the outside air temperature. You are literally cooling the plant from the inside out. Watch the video below to learn more about harvesting lettuce to ensure you have more than one harvest.