konijnenkeutels zijn goud voor je moestuin grondsoort
Bioretention areas function as soil and plant-based filtration devices that remove pollutants through a variety of physical, biological, and chemical treatment processes. The reduction of pollutant loads to receiving waters is necessary for achieving regulatory water quality goals.
Maybe what "volunteers" need to do before committing to anything long-term is more up-front questioning. Perhaps do a 1-2 day pre-visit prior to a committment. It is hard to discern much via email or even phone. I also think it ought to be acceptible for experienced and/or proven laborers...
Groenten in de tuin: het verhoogd bed en heuvelbed is een mooie methode om te composteren | Tuinkrant.com