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Rhubarb cultivation methods and techniques
First, the plant prefers a cool and dry climate, with cold temperatures. In general, it is not very picky about soil type, but it thrives best in deep sandy loam or loam rich in organic matter. This kind of soil provides good drainage and nutrients, which are essential for healthy growth.
Second, cultivation techniques play a key role in successful growth.
1. **Planting methods**: The plant can be propagated through seeds or buds. For seed propagation, there are two main seasons: spring sowing and autumn sowing. Spring sowing should take place around the Qingming Festival, while autumn sowing is done at the beginning of the Summer Solstice. Before planting, the soil should be well prepared by adding appropriate fertilizer and turning it over. Seeds are sown in rows spaced 50 cm apart, and the seeds are evenly distributed in furrows before being covered with soil and watered. Alternatively, seedlings can be raised with spacing of 25 cm and transplanted in the fall of the following year. A total of 1 kg of seeds per acre is typically required. For bud propagation, take the mother bud head and plant it in holes spaced 50 cm apart, with each hole 33 cm apart. Cover the buds with 3 cm of soil.
2. **Field management**: After seed propagation, when the seedlings reach a height of 3 cm, thinning should be done to maintain a spacing of 33 cm between plants. Throughout the growing season, regular soil loosening, weeding, watering, and fertilizing are necessary. Apply top dressing three times during this period. If you don’t plan to collect seeds, it’s advisable to remove the flower stems to promote better rhizome development.
3. **Pest and disease control**: Common diseases include root rot and anthracnose. To prevent these, crop rotation is recommended to keep the soil healthy and well-drained. Infected plants should be removed and burned immediately. For treatment, spray or water the area with a 1:1:120 Bordeaux mixture or 65–80% wettable powder diluted 500–600 times. Apply this solution every 7–10 days for 3–4 consecutive times. As for pests, scarab beetles and their larvae can cause damage. Adult beetles can be captured during their less active periods or using light traps at night. Larvae can be controlled with a 90% trichlorfon solution diluted 1000 times.
**Harvest and processing**: The roots are used for medicinal purposes. After three years of growth, harvest the roots after the Cold Dew and Frost Descent festivals, when the above-ground stems and leaves turn yellow. Carefully dig up the roots, remove the stems and leaves, peel off the outer skin, and dry them thoroughly for storage and use.