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Detailed Guide to the Management and Propagation Techniques of Dawn Redwood

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The dawn redwood favours a warm and humid climate, with cool summers, and winters with snow but not severe cold. The average annual temperature is 13°C, the extreme minimum temperature is -8°C, the extreme maximum temperature is 35.4°C, and the frost-free period is 230 days; the annual precipitation is 1500 mm, and the average annual relative humidity is 82%. The soil is acidic mountain yellow earth, purple soil or alluvial soil, with a pH value of 4.5--5.5. It mostly grows in valleys or near the foot of mountains, in places with gentle terrain, deep soil layers, and moist or slightly waterlogged conditions. It has strong cold resistance and strong resistance to waterlogging, and can grow in lightly saline-alkaline land.

The dawn redwood favours a warm and humid climate, with cool summers, and winters with snow but not severe cold. The average annual temperature is 13°C, the extreme minimum temperature is -8°C, the extreme maximum temperature is 35.4°C, and the frost-free period is 230 days; the annual precipitation is 1500 mm, and the average annual relative humidity is 82%. The soil is acidic mountain yellow earth, purple soil or alluvial soil, with a pH value of 4.5--5.5. It mostly grows in valleys or near the foot of mountains, in places with gentle terrain, deep soil layers, and moist or slightly waterlogged conditions. It has strong cold resistance and strong resistance to waterlogging, and can grow in lightly saline-alkaline land. It is a light-loving tree species with a well-developed root system. Its growth rate is often governed by soil moisture; in places with long-term waterlogging and poor drainage, it grows slowly, and the base of the trunk is usually swollen and has longitudinal ridges.

The dawn redwood is generally propagated by sowing seeds and by cuttings. The dawn redwood generally enters its peak seed-bearing period at 40-60 years of age. Sowing is carried out in late March, and the seeds germinate and emerge half a month after sowing. Hardwood and softwood cuttings are also commonly used for raising seedlings; using 1-year-old plump and vigorous branches cut from 5-year-old seedling trees as cuttings gives a high survival rate. Hardwood cuttings are taken in early spring; the cuttings should be cut immediately after leaf fall, tied into bundles, stored in sand over winter, and inserted after the weather warms, then watered immediately after insertion, keeping the bed surface moist. During the germination and leaf-unfolding period, water frequently and set up a shade frame. Softwood cuttings are taken in early to mid-June, selecting semi-lignified young shoots about 12-15 cm long, keeping 2-4 leaves at the top, and inserting them 4-6 cm into the soil; after insertion, water frequently and shade strictly, and roots form in 20-25 days. The seedlings reach 25-30 cm in height in the same year. During the seedling stage, attention should be paid to setting up a shade frame, watering frequently, and applying fertilizer appropriately.

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