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Planting a germinated biomass seed in a creep block that was hollowed out with a glaive will result in a plant sprouting up. Bonemeal doesn't work on the plant but by right clicking the creep block with blood will fertilize the plant. Fertilization is not required but significantly increases the rate at which the plant grows. A fully grown plant has swirls on the ends of its branches and can be harvested for 2 biomass and one biomass seed (that needs to be germinated at a blood alter) with a scythe. If it is harvested by hand it will return only one biomass seed.