Product Description How to Use 1. Please cut the rock wool into cubes according to your own needs with a knife before soaking. 2. Please simply soak the rockwool cube briefly (10 sec) in a nutrient solution to adjust its EC value and pH value. Don't squeeze it! 3. Use pH paper to make sure that its pH is in the desired range for your seeds. The optimum pH for most plant seeds is around 5.5. 4. Control the suitable moisture, illumination and temperature to improve the germination rate of seeds. 5. When the robust roots penetrate through the rock wool about 0.5-1 inches, transplant it into a suitable container. Specifications: Material: High quality basalt Size: 11.2*5.9*0.98inch Color:As picture shown Package include:1 sheet Garden Stonewool Grow Cubes Warm Tips: The rock wool cubes are formed by compression of transverse wire and the stratification is normal. When cutting, please use a wallpaper knife or scissors. In the process of use, please make sure that it is completely cut.