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Planting method and matters needing attention of nine-story tower
I. Soil

Nine-story tower is barren-resistant but clay-resistant, so sandy soil with good drainage should be selected for planting nine-story tower. Its roots will grow very deep, the deepest can reach 50 cm underground, and the soil preparation should be as deep as possible, and enough farmyard manure should be added.

Second, sowing

Nine-story towers are generally sown and propagated, which can be planted in March and April in the southern region, and should be appropriately delayed until the end of April to the beginning of May in the northern region. Sow the seeds in strips, with an interval of about 30 cm. Sow the seeds at a distance of 15 cm, then cover with a thin layer of soil, and wet the soil after sowing.

Third, water and fertilizer

The nine-story tower likes humid environment, so it needs to be irrigated in the field in time when it is dry in summer. If there is no rain, it should be watered every five days on average. When fertilizing the nine-story tower, nitrogen fertilizer is usually applied to promote the growth of leaves, but the fertilizer should not be too thick, so as not to cause the plant to grow in vain and reduce the quality. Bika water-soluble fertilizer can be selected.

Fourth, matters needing attention

When harvesting the 9-story tower, it should be noted that different harvesting methods are selected according to different purposes. Generally, stem and leaf harvesting can be started in July, but it must be finished before August to avoid affecting the quality of the 9-story tower.