Vermiculite is used in the horticultural industry because they both provide aeration and drainage.
It is sterile and free from diseases, they have a fairly neutral ph (especially perlite which is neutral), and readily available, non-toxic, safe to use.
Vermiculite is a naturally occurring mineral that is used in gardening. Add vermiculite to your potting mix to improve the aeration of soil and increase the water holding capacity. You can use it to enhance seed germination and condition the soil because of its aeration and water-holding properties.
- It does not rot
- Improves the soil structure through soil aeration
- Increases water and nutrient retention