A two year study with
transplanted organic romaine lettuce in Salinas, California investigated agronomic aspects of lettuce
monoculture and lettuce-alyssum strip intercropping on beds in replacement intercropping treatments
where alyssum transplants replaced 2 to 8% of the lettuce transplants, and in additive intercropping
treatments where alyssum transplants were added to the standard lettuce density without displacing lettuce
transplants.