A head of Romaine lettuce will grow even in a small 4 inch pot, because it does not get a root. It just sucks up the water and nutrients through the bottom of the lettuce plant. Amazing how little soil it needs! Just set it on top of the soil and keep the soil moist. I have my plants crowded in boxes that are only about 16 in by 6.5 in by 6 in deep. I can fill that with about 4 or 5 lettuce plants from the store.
I crowd in parsley, lettuce, onion, beet tops, carrot tops, celery all in one little box. For some reason it just grows. If you have a kitchen counter you can put the box on the back of the counter and attach a small florescent grow light to the bottom of the cupboards. That is all they need to grow! And it is fun watching them grow!
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