Prima Forest is a medium-dark green romaine with a yellow interior heart. It has downy mildew resistance and high tip-burn resistance and medium sclerotinia tolerance. Its height is slightly shorter than Green Forest and is adapted to fresh, hearts, and processor markets. Prima Forest holds better for twisting of ribs caused by weather abnormalities and also holds better against fringe burn compared to Green Forest making it ideal for a premium fresh market lettuce. Maturity is 2 to 3 days later than Green Forest making it ideal to split blocks with Prima Forest and Green Forest to stager harvest. Weight is heavy and has thick leaf texture. Plant Prima Forest against similar varieties like Green Forest, True Heart, Sun Valley, Stryker, Heart breaker, and Green Thunder.