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===Stone mulch===
 
===Stone mulch===
Finer inorganic mulch materials can be of value applied in areas with extended ponding times i.e. in the the centre of recessed, bowl shaped [[biorertention]], [[stormwater planters]], [[trenches]] or [[swale]] practices. Inorganic mulches resist movement from flowing water and do not float. Applying a thin layer of inrgonaic mulch over the top of wood based mulch has been shown to reduce migration of the underlying layer by around 25% <ref>Simcock, R and Dando, J. 2013. Mulch specification for stormwater bioretention devices. Prepared by Landcare Research New Zealand Ltd for Auckland Council. Auckland Council technical report, TR2013/056 </ref>.  
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Finer inorganic mulch materials can be of value applied in areas with extended ponding times i.e. in the the centre of recessed, bowl shaped [[bioretention]], [[stormwater planters]], [[trenches]] or [[swale]] practices. Inorganic mulches resist movement from flowing water and do not float. Applying a thin layer of inrgonaic mulch over the top of wood based mulch has been shown to reduce migration of the underlying layer by around 25% <ref>Simcock, R and Dando, J. 2013. Mulch specification for stormwater bioretention devices. Prepared by Landcare Research New Zealand Ltd for Auckland Council. Auckland Council technical report, TR2013/056 </ref>.  
 
Inorganic mulches which may be available locally, include:
 
Inorganic mulches which may be available locally, include:
 
*Crushed glass
 
*Crushed glass
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