Trdinka is a traditional corn variety originating from Bohinj. This indigenous type of corn is adapted to the Alpine regions. The kernels are yellow, orange, and red-colored, typically milled into coarse flour. The flour is used to prepare a local polenta-like specialty known as bohinjski žganci.
The field where the corn grows should be in a sunny spot, and it's fertilised and ploughed in the autumn. The corn is stored in a dry place, and the cobs are often hulled in the week before Palm Sunday. On the good cobs, a few husks are left intact before they're braided and the cobs are left to dry.