Expanded Perlite: An Eco-Friendly Growing Medium Perlite is a naturally occurring siliceous rock that has been expanded or "popped" by heating it to high temperatures. This process creates an lightweight expanded material that has horticultural and construction uses. As angrowing medium, expanded perlite has benefits over other standard soilless mixes due to its lightweight, insulating properties and pH buffering ability. This article will...
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