Here’s one example of growing lettuce and ornamental plants together in one container. In the middle are canna plants (not yet in bloom) and Frillice lettuce around the edge of the container.
The technique is to use a growing medium that is rich in organic matter. The plants could be nourished with slow-release fertilizer or with vermicompost. The plants should be watered regularly but not over-watered.
This is showcased in the ongoing Open House of Allied Botanical Corporation in its experimental farm in Tayug, Pngasinan, which will run through Sunday, Feb. 7, 2016.