– the base on which an organism lives
|Inert Media||No buffer||W.H.C.*|
|Stone wool||made from melted volcanic rock spun into fibers||High|
|Glasswool||made from melted and spun into fibers||High|
|Perlite||made from heated crushed volcanic lava ore||Low|
|Foam||polyurethane or polystyrene||Medium|
|Pumice||made from crushed lava ore||Low|
|Volcanic Rock||use in Hawaii||Low|
|Sand||traditional hydroponic medium||Medium|
*W.H.C. = Water holding capacity.
|Other Media||Some buffer||W.H.C.*|
|Clay Pellets||baked expanded clay (also called clay rock)||Low|
|Vermiculite||heated and expanded micaceous mineral (ala silicate); mostly used as seeding medium only||Medium-High|
|Coco Fibers (coir)||husk from a coconut shell||Medium-High|
|Sawdust||used by growers in Alberta, Canada||Medium|
|Gravel||traditional hydroponic media||Medium|
|Rice Hulls||mostly used as a potting mix amendment||Medium|
Soil or Hydroponics?
Why switch from soil/peat/coco to Grodan Rockwool?
You may be thinking to yourself, “I do pretty well in my potting mix, why would I want to switch to Grodan Rockwool?” The answer to that question is a long one, as there are TONS of benefits to growing in rockwool instead of soil, coco, or peat. In this “Sold on Soil?” section, you can learn about the many advantages of growing hydroponically in Grodan Rockwool.
Rockwool and Soil Mixes: “By the Numbers”
Before purchasing your future growing media, consider the following differences between Grodan Rockwool and soil or peat based potting mixes. By choosing to grow your plants in Grodan Rockwool you can save money, water, space and nutrients.