Some recent numerical and anecdotal data:
Rising food costs turn US city folk into do-it-yourself farmers:
"Mr George Ball, chairman of W. Atlee Burpee, the country's largest seed company, said he has seen a 30 to 40 per cent increase in vegetable seed sales this year.
'I think the thing that tipped the scale was the fuel and food costs. This is a big deal for middle-class people.'"
Sales of veg seed soaring
Americans fed up with high produce costs turn to planting gardens