Designed to grow herbs and small plants at home, the amphora consists of a vase and a porous pot. You have to fill the vase with water to the top by adding a few drops of fertilizer, the plant will have enough to grow, and place the pot inside with the seeds you choose. As the roots absorb water they grow more and more, going down looking for water. The water level drops, but the system is compensated by the lengthening of the roots.
It is a simple concept, which you may not care about at first. When the water is almost used up, you will have an adult plant ready for planting.