The original Grodan Delta rockwool blocks available in 3" and 4" versions with 1.5" or 1" insert holes, great for transplanting cuttings into before going into a hydroponic system or even coco pots.
Pre soak rockwool blocks in a low strength nutrient and root stimulant at a pH value of around 5.3-5.5, the rockwool will raise the pH levels. allow to drain before planting into.
3 inch cubes strips of 8
4 inch cubes strips of 6
* Box pricing available.
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