Rockwool has been developed as a nutrient culture medium in the Netherlands. The rockwool culture system was introduced to Japan in 1983 and has been expanding in tomato and rose culture. Rockwool as a culture medium has been used in a slab bed system. In this system the rockwool fibers are mixed with a binder and formed into a rectangular shape. In contrast to the rockwool slab, granular rockwool has not been popular, although granular rockwool for potted plant media is effective for improving of physical soil conditions. We believe the reason for granular rockwool's lower popularity is high price. On the other hand, granular rockwool has attracted attention as an alternative construction material to asbestos and every year has been used at 200,000 tons in Japan. So we converted rockwool used in the construction field to the agricultural field, and developed a new granular rockwool for horticulture.
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