Mini Hydroponic Grow Systems Rock Wool Cubes

Mini hydroponic grow systems often use rock wool cubes as a growing medium. 

Rock wool is a type of mineral wool made from basalt rock and chalk. 

It is an inert material that does not contain any nutrients, but it provides excellent water retention and aeration for plant roots. 

The cubes are typically used to start seedlings or to propagate cuttings, and they can be easily transplanted into larger hydroponic systems once the plants have established roots. 

Overall, rock wool cubes are a popular choice for mini hydroponic grow systems due to their affordability, ease of use, and effectiveness in promoting healthy plant growth.