Oh, I like this question. Our
local community garden is adjacent to our neighborhood playground, and I've been concerned about chemical pesticide/herbicide use as well.
One thing that has been to help encourage
perennial agriculture and less soil disturbance in our local community garden where user turnover and annual veggie production is the norm is that one whole length of the garden outside of everyone's allotments has been dedicated to fruit crops that are to be shared by all members.
Another small step is that the
city has been good as providing a large pile of woodchips every season and encouraging community gardeners to mulch to
save water and reduce weed pressure.
Perhaps if you want to give a talk to folks in that setting, you might emphasize the time saving and cost saving aspects of
permaculture - community gardeners have to travel from their homes to their plots, and focusing on the labor and time saving elements of
permaculture might help to draw them in.
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