RedPower2 adds Flax, a plant that can be farmed, yielding String rather than Wheat. Flax Seeds & string can be obtained by breaking tall grass, similar to regular seeds. The Flax seeds look similar to a Pumpkin Seed, so don't confuse them. Farming is also similar to wheat farming, except that flax can only be planted on hydrated farmland [Dark colored fertile soil]. Breaking the mature plant will give you some seeds and string. For optimum drops use a Sickle.