Add the radish seeds to a glass jar and pour in enough water to fully submerge them. Cover the jar by loosely attaching the lid or securing a piece of cheesecloth over the opening with a rubber band. Allow the seeds to soak for at least 8 hours, or ideally, overnight.
Once the radish seeds are soaked, drain them and then return them to the jar.
Cover the jar using either a piece of cheesecloth or a mesh sprouting lid. Place the jar on a sprouting stand or lay it on its side, depending on your preference.
Rinse and drain the radish seeds daily for 2-3 days, or until the sprouts reach your desired size.