Reproduction and cultivation methods of Rehmannia and precautions
Rehmannia, highly favored in the field of traditional Chinese medicinal materials and ornamental plants, attracts many planting enthusiasts with its elegant bell-shaped flowers and medicinal value. However, many people often encounter problems such as withered plants and few flowers during actual operations, which are often related to improper mastery of basic maintenance methods. This article summarizes the five key maintenance dimensions through field planting experience.
Soil and Light Management
Substrate Selection Criteria
Sandy soil is the ideal carrier for the growth of Rehmannia, as its loose and breathable characteristics can effectively prevent waterlogging. It is recommended to use a mixture of 70% river sand and 30% humus soil, which ensures drainage while providing necessary nutrients.
Light Control Plan
Daily 4-6 hours of scattered light is optimal, with full sun exposure in spring and autumn, and strong light filtered by shade nets in summer. Maintain a distance of more than 2 meters from tall crops to avoid creating light盲 zones.
Water and Fertilizer Control Techniques
Precise Irrigation Method
Adopt the "dry-wet" principle, watering deeply when the topsoil is dry by 1 centimeter. Digging drainage ditches before the rainy season, combined with mulch covering, can reduce the risk of积水 by more than 70%.
Scientific Fertilization Schedule
Use fully fermented livestock manure as the base fertilizer, and apply diluted fish肠 water (1:50) every 15 days during the growing period. Adding phosphorus and potassium fertilizers during the budding stage can improve flowering quality, with care to avoid contact with stems and leaves.
Propagation and Pruning Essentials
Root茎 Treatment Details
Select healthy rootstocks with a diameter of 1cm or more, cut obliquely at a 45-degree angle, and dip in wood ash to dry. Using ridge cultivation with a 20cm plant spacing can increase the survival rate to over 85%.
Regular Maintenance Strategy
Remove weeds and loosen the soil monthly, and immediately remove yellow leaves. After flowering, cut back to the base with 3 pairs of buds to stimulate new growth.
Disease and Pest Control Methods
Disease Response Plan
For the early stage of leaf spot disease, spray with garlic extract (100g/liter), and switch to 80% mancozeb 800 times solution for severe cases. Regular crop rotation can reduce the incidence of soil-borne diseases.
Pest Control Measures
Hang yellow sticky traps to control thrips, and use azoxystrobin suspension during the爆发期 of red spider mites. Manual removal of butterfly larvae is also effective.
Environmental Adaptation Strategies
Seasonal Management Essentials
Maintain a winter survival temperature above 5°C, and it is recommended to use double-layer greenhouses for insulation in the northern region. Turn on circulating fans during high summer temperatures to maintain air circulation.
Space Layout Optimization
Indoor potted plants should be placed on the southeast-facing windowsill, with additional lighting for 2 hours daily. Regularly rotate the pots to ensure even light exposure.
Through systematic maintenance management, Rehmannia not only displays good ornamental value, but its accumulation of medicinal components also significantly improves. It is recommended that growers establish a maintenance log, recording plant changes after each operation, and gradually forming a personalized cultivation plan. It is worth noting that the crop rotation period of Rehmannia rootstocks should be controlled to be over 3 years, which is crucial for maintaining soil fertility.