The Lechuza Pon Plan Substrate is the perfect alternative where conventional soil cannot or should not be used. It consists of high quality, mineral stones, that are free from contamination and pollutants. It is also free-flowing and can be used on its own without any soil to fill the planters. Lechuza Pon has the optimal air/water ratio for plants of 45% water / 55% air. The vulnerability to diseases is reduced. Even after some time, the structurally stable plant substrate does not condense and it keeps its air-permeable structure. It can be used for years, without having to be replaced.