The key ingredients of All Per-Plus are derived from the natural elements of plants, with no chemical added like it is intended to by nature. It is not harmful to smell, taste, or touch. Its components are essential for human and plants alike as we are one with nature. It helps to build and heal the plant immune system through its roots and leaves. It can be used in any stage of growth from seedling to the day of harvest with no after taste. Your plants will appreciate it and will definitely show it.