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Old April 3, 2020   #9
zipcode
Tomatovillian™
 
Join Date: Jun 2010
Location: Romania/Germany , z 4-6
Posts: 1,582
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Not sure raised beds would be much protection against RKN, at least not for long.
In containers, as long as one is careful, I think you can use the same medium for a few good years. The time will be probably decided by how compact it gets, after 2-4 years, depending with what you started, it decomposes to finer particles and becomes increasingly less aerated.
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