I had bought a complete kit from a different brand that included these same growing trays and loved them so much that I decided to purchase these so that I could grow more. This set does not include any seeds but I found some oat, wheat and barley seeds at our local farm store. I like that these come in different colors so that I am able to color code my seed and know exactly what seed is in each container by the colors of the planters. I do like the tools that come with it and the rubber feet stickers keep the container from sliding around on surfaces while our pets eat the grass. This can be used with soil or hydroponically.