Where is the purple crown city?

The violets in Toulouse developed into the symbol of the city in the19th century and won the title of "Violet City" for Toulouse.

Violet originated in southern Europe and is very popular in Europe and America. The flowers are faint and fragrant, and Europeans use them to make perfume, which is very popular with ladies. In medieval southern Germany, it was also a custom to hang the first bunch of newly picked violets on the mast every year to celebrate the return of spring to the world. Distribution of origin of violets Violets originate from southern Europe and the Mediterranean coast, and are one of the famous flowers in Europe. Introduction is common in big cities in southern China, while in the north it is planted in garden flower beds or greenhouses for viewing. This kind of flower is similar to pansy and is easy to be confused. The origin environment of violets Violets like cold climate and avoid hot and dry. I like a well-ventilated environment and a mild climate in winter, but I can also withstand a short-term low temperature of -5℃. The optimum temperature for growth is about 15- 18℃ during the day and 10℃ at night, which has low requirements for soil, but it grows well in neutral and alkaline soil with good drainage, so avoid acidic soil. Violet is cold-resistant, not tolerant of shade and afraid of waterlogging. It is suitable for living in higher places, and it is prone to pests and diseases in the case of hot weather and poor ventilation. Fertilization should not be too much, otherwise it is not conducive to flowering, and insufficient lighting and ventilation are prone to pests and diseases.