Lettuce and Greens These semi-delicate plants need to be given partial shade during the summer months and given full sun in the cooler winter months.  These are tender plants that can be tucked in and amongst other taller plants, or put out in rows with each other.  When transplanting an individual lettuce, add one-half handful of both landscape mix and worm castings to each hole.  You can prolong the harvest period of your greens by picking the older, outer leaves of each plant first, and working your way in.