I don't think that's quite what the British used it for during the London bombings of WWII. Somehow, the image of Winston Churchill telling Londoners to never stop fighting, and never stop using cabbage to spruce up their bombed-out decor doesn't quite jive. But it's a novel idea. That being said, I couldn't quite bring myself to buy any because I have no idea how I would explain it to friends and family who would visit in the future. The conversation might go something like this:
Mom: Hello all. My, what colorful plants you have in your front yard. What is that?
Me: That's the decorative cabbage, mom. If you'll pardon the expression, we thought it added some flavor to the front of the house.
Mom: Isn't that what Londoners ate while the Nazis bombed them?