Scientific name Centaurea cyanus L
Alias ​​orchids
Asteraceae
Morphological characteristics One or two years grass flowers, multi-branched, stems and leaves with white wool, leaves linear, full; stem often teeth or pinna. Inflorescences terminal, marginal ligulate flowers funnel-shaped, petal edge with teeth, the central flower tubular, showing white, red, blue, purple and other colors, but mostly blue. Flowering from April to May. From July to August, the seeds were collected and the dried inflorescences were picked and dried to thresh storage. It is native to the southeast of Europe, with a cool, cool climate and a fertile, loose soil.
The main points of the planting season can be planted in spring and autumn, and autumn sowing is better. In the middle and late September, plant seeds in a prepared nursery bed, cover the soil with seed not seen, pressurize it slightly, cover with grass, and pour enough water to keep the soil moist. After germination, cover the grass. When the seedlings have 6-7 leaflets, they can be transplanted or colonized with a spacing of about 30 cm. After planting a living, the decomposing human feces and urine is applied once every 10 days or 5 times in the bucket water, and it is stopped until the second year in March. Fertilize to bloom. If it is potted, the potted soil should be loose and fertile, and the most used garden soil rot leaves, grass and wood ash should be mixed with mixed soil. When the seedlings have 6-7 leaves, they are transplanted for the first time; after they grow, they will change to three cylinders. In the pot, because cornflowers are straight roots, large seedlings are not resistant to transplanting. In winter, it can be buried continuously in the soil for the winter and taken out in early March. Fertilization should be carried out until the buds appear.
For horticultural use, the dwarf plant is only 20 cm tall and can be used for pot planting; the high planting species is suitable for cut flowers, and flower beds and large natural plantings are arranged.
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