Focus on this artwork and discuss the Imperial fritillaries.
Imperial fritillaries (Fritillaria imperialis) are bulbs that were grown in France and Germany at the end of the 19th century, nowadays they are generally seen in gardens in Europe during spring (April and May). Because of this it is assumed that Van Gogh painted this work at that time of year. The orange-red flower is also known as the imperial crown or kaiser's crown. Each bulb grows between three and ten flowers, so Van Gogh used one or two bulbs to make the bouquet depicted in this picture.
Fritillaria imperialis