The video link seems to have disappeared from the original blog, but I found it
here
Carol has a small garden (only a little bigger than a
plot) and started off with no soil and now (in the film) produces her family's vegetables for 7 months of the year. She does use a fair amount of inputs as she grows intensively - sawdust, manure, bone meal, fallen leaves. She also returns nutrients to the soil with composted waste, and starts vegetables off inside under grow lamps. I think she gives some good advice for beginner gardeners.