In the depths of winter, I'll succumb to temptation and buy a small burgundy head of chioggia radicchio at our local natural foods cooperative. I'm shocked at the price of a green that in my experience couldn't be easier to grow. Perhaps people think that because of its high price it must be challenging to grow. Or perhaps they don't think they like its slightly bitter note when served raw. Perhaps they've never tasted how delicious it is when picked young and grilled  or roasted or sautéed. It asks to be paired with the dark sweetness of balsamic vinegar, and is a revelation grilled and wrapped around fresh mozzarella. What's more, radicchio adds a lovely bit of color to whatever dish you make.
When I visit Italy, I am wowed by the varieties of radicchio in the green markets: the tall treviso, the nearly scarlet varieties, the chubby balls of maroon chioggia. The Italians are passionate about this variety of chicory; according to Wikipedia, even back in 77AD Pliny the Elder extolled its virtues.
Well, I can't get enough of the stuff in my kitchen, and so I grow a lot of it. Radicchio's a cool weather plant, which ordinarily would mean planting it in late summer here in Vermont and harvesting it in deep fall, but I grow and harvest it from April until November. Indeed, it's already growing away down in my basement under grow-lights next to its cousin endive. By late March it will be about four inches high and ready to go outside under a tunnel if it's a bitterly cold spring, or out in the open garden if no deep freeze is predicted. Radicchio doesn't mind a light frost, and it likes to mature in cool conditions, so I don't worry about it shivering.. If the temperatures threaten to dip into the low 20s, I'll slip an old plastic milk jug over each plant to give it just a bit of protection.
On the other hand, during a hot summer it can grow bitter and tough, and so I throw shade netting over it in high heat. Its shallow root system makes it thirsty, so when it's dry, I'll give it a drink to prevent it from getting bitter.
To get the most out of a head, I don't dig up the whole thing at once until it is quite mature--about three months after I plant the seeds. But early on, I start taking a few leaves from several plants at a time, without harming the plant which will continue to tighten its head as it matures.
And so, yes, I treat myself to outrageously expensive radicchio in the winter once or twice in that short period when it is not growing in my house or in the garden. But now that it's March I cheer it on when I head down to my basement growing station. Soon, soon, it will play a starring role on our table.
To read more of Barbara's Garden Writing, visit Open View Gardens .