Hemp is a strong fibrous plant that can be used for many different things, including strong Rope or Fabric
Hemp seeds, with HCSeeds enabled, can only be obtained from tilling the ground with a hoe; without HCSeeds they drop from tall grass.
These seeds must be planted on hydrated farmland and have plenty of light, be that sunlight or from a Light Block.
Growth can also be accelerated by fertilizing the farmland.
Hemp has two stages, it is best to let the plant grow to stage 2 and only harvest the top block, similar to Sugar Cane.