That was the case through 2007, but there's substantial anecdotal evidence that this year's jump in gardening was significantly larger than previous years, and that the extra was largely motivated by economics.

I know two people, not normally known for their vegetable gardening, who have taken it up this year.

In their cases they are not driven by the glamour of freshly-grown Rocket for yuppie dinner parties.

Still, it's interesting that an increasing number of millionaires are following Rainwater's and Simmons' leads in establishing their ability to grow at least part of their own food.

http://www.energybulletin.net/11695.html
The Rainwater Prophecy (December, 2005)

Back on the farm that night, he (Rainwater) and Moore discuss future projects with their landscaper, Jenks Farmer, over a glass of wine. Farmer, who has a master's in horticulture and lives on the property, maintains Moore's extensive gardens, including vegetable beds that produce all year round. That morning Rainwater had been surfing the web, researching greenhouses in his quest to further ensure a steady flow of food through the winter. At his prodding, Moore has installed an emergency generator and 500-gallon storage tanks for diesel fuel and water. When Rainwater says that he's thinking about opening a for-profit survivability center, it's not entirely clear that he's joking.