Further definition of the ODEX may be read here: From detailed energy efficiency indicators to an aggregated energy efficiency index called ODEX (http://www.monitoringstelle.at/fileadmin/docs/de/Diverse_Dokumente/Definition_Odex.pdf)
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It will keep weeds away; protect the plants by keeping the soil cool; decrease evaporation and reduce soil compaction. Be creative and use materials like: pebbles, bark chippings, gravel, cocoa shells, decorative pine cones, marbles, broken crockery, grass clippings or leaf mould. But avoid mulching too close to the stems to avoid the plant rotting in winter.
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