If you are growing marijuana in hydroponics you will need soilless growing mediums to grow the plants in, since you are not using soil. The growing mediums provide support for the root system, as well as hold and make available oxygen, water, and nutrients. Texture, pH, and nutrient content, which is measured in EC (electrical conductivity) are the three things that contribute to cannabis roots’ ability to grow in a substrate.
Hydroton Rocks Soilless Growing Mediums
Hydroton Grow Rocks are the best soilless medium to use for hydroponic cannabis growing, as they are inexpensive and can be re-used many times. I use Grodan Rockwool Cubes to start my clones, then I transplant them into larger grow buckets or pots with hydroton rocks to fill the bucket.
Rockwool Cubes Soilless Growing Mediums
Fibrous materials like vermiculite , peat moss, rockwool, and coconut coir retain large amounts of moisture within their cells. These are perfect for passive hydroponic systems that operate via capillary action. I only use Grodan Rockwool Cubes along with Hydroton Rocks, although I have listed a few extra growing mediums that work well.