Radicchio has been around since ancient times. Described by Pliny in his Naturalis Historia, radicchio was first bred by the Egyptians from chicory as a blood purifier and cure for insomnia. It’s a part of the composite family.
In the 19th century a whitening technique called imbianchiamento was invented by Francesco van den Borre, a Belgian gardener working in the Veneto who used techniques for whitening Belgian Endive to create the white veins on the red leaves of Radicchio Rose di Treviso.
Imbianchimento is an elaborate and fascinating process. The radicchio plants are harvested with a special machine and then packed into baskets made of wire mesh which get stored in dark sheds. Spring water is circulated at a temperature of sixty degrees, and this is what gives the plants their red color. Some radicchio is finished in warm sand beds.
Here in the U.S. we’re mostly familiar with the tightly wound spheres of deep purple red radicchio the size of a grapefruit. These varieties are Rosso di Chioggia and Radicchio di Verona. Italy takes agriculture seriously and there is a certification called indicazione geografica protetta. IDG follows the names of "protected" varieties.
Radicchio di Castelfranco IDG (green and white with bright red variegation) is a cross between escarole and Rosso di Treviso IDG. Other varieties include Radicchio di Maserà and Radicchio di Lusià and Rosso di Verona IDG.
I look forward to planting some radicchio in our garden this summer, if only to take me back to our wonderful trip and the boxes of Treviso in the markets. The photo of the box of romanesco, asparagus and cauliflower was taken at the Mercato Centrale, in Florence (above).



