But when it came time to plant them in the garden, I realized two things. 1) I had planted too much lettuce for the space I'd alloted, and 2) summertime comes quickly here, and they'll soon begin wilting in the heat.
My solution? A bit of an experiment, really. I wanted to try growing the lettuce plants indoors, as effectively as possible, and without soil.
This is what I came up with. Each plastic tub has a water/fertilizer mixture in it. I'm mixing a couple of fertilizers, so I'll let you know how they work. The plants in the tub to the right are in cups with orchid mix to help support them. There are holes in the cups so the water gets in and the roots can grow through.
The tub on the left has much smaller holes and no cups. The plants go directly into the water beneath the lid. I stretched a piece of plastic wrap across the top to help support the plants until they get big enough to not fall through the holes in the lid.
In each tub there is an aerator from an aquarium with a single pump powering both. This should help keep the water aerated and from becoming a stagnant mess.