1. Grow Gourmet and Medicinal Mushrooms
Growing mushrooms can be very lucrative. However, I recommend that you opt for specialist types of mushrooms if you're looking into cultivation. There is more money to be made from growing ones for medicinal use or the restaurant market. Depending on the type of mushroom you choose, you could harvest some in just 15 weeks, with a yield of up to 4 lbs. per square foot.