Leca Clay

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LECA 8/16mm - (Lightweight Expanded Clay Aggregate)

Lightweight Expanded Clay Aggregate (L.E.C.A.) a type of clay growing medium which is super-fired to create a porous texture. 

Grow rocks are a non-degradable, sterile growing medium that holds moisture, has a neutral pH, and will wick up nutrient solution to the root systems of your plants.