1. A lemon. Make sure you purchase an organic lemon since some non-organic lemon seeds may be “duds”, incapable of germinating. Any organic lemon will do, but if you have climate or space restrictions, you may want to try looking for a specific variety called a “Meyer” lemon. Meyer lemons are a smaller type of lemon, often grown for ornamental purposes, and are thus better suited for indoor containers. I chose Meyer seeds for these reasons, but you can use any seed that makes sense for your situation.