1. Sowing date: Campanula purpurea is a cool-loving plant. It is best to start sowing in late summer, grow for several months in winter, and complete the whole growth process in the following spring. In this process, the illumination time should reach at least 14 hours per day, and the viewing period is longer, which takes about 30 days from the appearance of flower buds to flowering. If long-term sunshine treatment is carried out, it should be sown in June 5438+065438+ 10. Under natural conditions, sowing in February and June 5438 can grow in summer.
Second, the propagation method: the propagation of purple flowers of the genus Campanula is usually sowing, and the sowing time is August-September in autumn. Sow the prepared seeds in shallow pots or wooden boxes and place them in the shade. The seeds of Campanula purpurea are very small, so they can't be covered with soil after sowing, that is, they can't be seen. When watering the seedlings, you can use a small hole pot or sprayer to spray water to avoid flooding the seeds and rotting the roots.
Third, seedling treatment: after the seedlings grow roots, they can be transplanted and still be in shallow pots. Care should be taken not to break the roots when transplanting. When the seedlings grow to almost 5 cm high, they can be transplanted into pots with a height of 10 cm. After the roots of the seedlings are full, change the pots, and repeat this for two or three times until the last flowering year, and transplant the pots to flower beds or the ground.
4. Fertilizing and watering: Bluebell flowers should maintain a relatively high relative humidity before radicles appear, and the substrate should be relatively moist. When necessary, cover the new seedlings with a layer of coarse vermiculite to keep moisture. If you want to make seedlings grow rapidly, you can apply 30 ~ 50 ppm calcium nitrogen fertilizer, and then apply calcium fertilizer on this basis to make them grow rapidly.
5. Illumination treatment: Campanula belongs to purple flower, which likes long sunshine, and it can bloom naturally with sunshine 14 hours every day. If it wants to blossom early, it only needs 4 hours of intermittent nights in 30 days. Purple flowers of Campanula don't need growth regulation and enucleation. In the early growth process, the appearance of purple flowers of the genus Campanula is messy, but in the later growth process, it will naturally be adjusted neatly and compactly, so it does not need special adjustment.
Attention of intransitive verbs: it takes two winters for the purple flowers of the genus Campanula to bloom, so it needs patient cultivation, especially in hot summer weather, which can easily lead to plant withering. Potted bluebells can't be placed on the back of high-rise buildings to prevent sun exposure, and water spraying on leaves should be strengthened in time to cool down. Campanula purple flower is also a positive plant, so it can't be kept in the shade for a long time, lacking light.