1.   But the lowly lettuce plant is starting to change all that.

2.   Deuel pointed out, in fact, that some lettuce plants are temptingly close to hamburger stands.

3.   Empty half-gallon milk jugs have their bottoms sliced off and become mini-greenhouses for tender new lettuce plants.

4.   Even in small spaces, a large number of modest-sized lettuce plants can be grown.

5.   The first genetically engineered lettuce plants to undergo field testing have been unveiled by University of Florida scientists.