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What is Grodan Stonewool?

It is back to Nature. The raw material is basalt rocks and chalk. These are melted at 1600 C°. The lava is blown into a spinning chamber, which pulls the lava into fibers, much like ‘cotton candy’. When Mother nature makes this wool we call it ‘angel hair’. If you have ever visited a volcano, you may have seen the fluffy angel hair flying around.

We pack the fibers together into a mat and cut Grodan slabs & cubes from it. The stonewool granulate is bags with little flocks of 'angel hair'.


Important facts about Grodan Stonewool

  • Grodan stonewool was developed in Denmark in the early 1970's.The process makes excellent use of nature resources; We can produce 37 cu.ft. of wool from 1 cu. ft. of rocks.
  • Today most Grodan is pro-duced from recycled Grodan. (recycle)
  • Grodan stonewool is the main reason that most of the worlds greenhouse vegetables are now grown hydroponically.
  • At full saturation, Grodan holds 80-90% of its volume in water. It is wrapped in biodegradable plastic and the stonewool can be re-used in your garden to improve the aeration and water holding capacity.

  • Grodan stonewool went into space on Challenger in 1986 and is still being used in NASA's testing with hydroponics.
  • You will also find Grodan products at the EPCOT center / Walt Disney in Florida
  • You will find Grodan stonewool in some garden centres and in virtually all hydroponics shops in North America.



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