Improved 'Carnaval' weigela. Representing some of the best weigela breeding the world has to offer, the Czechmark® series comes from the Czech Republic. Each variety is selected for superior flower set and crisp, pure color. Czechmark Trilogy ® weigela is an improved version of the perpetually-popular 'Carnaval.' Flowers start out white and soon transition to pink, then finally red. This results in an eye-popping combination of three colors at once on the same plant.