Grand Rapids TBR Looseleaf lettuce seeds produce a large, upright rosette of thick, juicy, light-green, frilly leaves and a blanched centre. This tipburn resistant (TBR) variety has good flavour. The variety features very rapid growth in spring and fall, and grows better than any other variety under cool, damp, low-light conditions. Try Grand Rapids TBR in cold frames or beneath a cloche greenhouse for salad production all winter. In the spring and summer, sow short rows often so the crop can be harvested over a long period, and so that you are not overwhelmed by a garden full of mature lettuce all at once.