"Blue Demon Ji" is a kind of processed flower, which originated in the Netherlands. It is a kind of colorant and dyeing assistant that is harmless to human body. When the white rose is about to mature, cut it off and put it in a container filled with colorant, so that the flowers can absorb the colorant like water. According to flower experts, there are few blue roses growing naturally in the world at present, and the "blue enchantress" on the market now is the product of artificial dyeing.

The more formal "blue enchantress" begins to dye in the growth period of flowers, and the color can be evenly attached to the petals, which looks more natural; Some vendors dye ordinary white roses blue directly after picking, which is unnatural and easy to fade. Mainly distributed in North China, Northwest China, Southwest China, Japan and North Korea, and also widely planted in many other countries.