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While awaiting the CIGA inspector number 2. I thought I would try to grow some microherbs on the wool, since my tests have shown that it seems to hold water from evaporating rather well.
Rock wool is used in hydroponics because the structure can hold large amounts of water and air for developing roots and provided a good 3d structure to support them.
For simple cress, it works marvellously. With just one initial watering of the insulation the cress was able to grow and complete it's life cycle on a 30degree day.
From what I understand rock wool for hydroponics has been treated to bring the pH to a foliage friendly range. Not sure about glass wool.

Egg and cress roll anyone?


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