I have recently been looking at houses built out of hempcrete. Like bamboo, hemp (not marijuana) takes 3-4 months to grow to be harvest-able, but hemp grows in many climates and can be harvested up to 4 times per year. Hemp, mixed with lime, is used as an infill product with a timber frame. Because of the infill, less timber is required than a standard wood-framed & walled house. It is breathable (no mold or mildew issues), pest-resistant, fire-resistant, and has been tested to withstand strong earthquakes. It also removes CO2 from the air and it keeps the temperature of the house consistent. There is little to no-waste of the hempcrete when building. It definitely fits with the "circular economy."