The roof garden is constructed on flat roofs, platforms, or parapets of buildings, and its ecological conditions are generally more challenging compared to ground-level gardens. As a result, maintaining flowers and trees in such environments can be more difficult, especially during the hot summer months. Having worked in the maintenance of rooftop greenery for many years, I have gathered valuable insights and would like to share them with you now.
**Early Fertilization Based on Phenological Cycles**
The surface of a rooftop garden is typically made of concrete, which absorbs and retains heat very effectively. By understanding this characteristic, it's important to apply fertilizer early in the spring. Use diluted liquid manure and alternate between root fertilization and foliar sprays. This method helps rooftop plants enter their blooming season earlier than those in regular landscaping areas, leading to earlier flowering and extended bloom periods. During the hottest times of the year, avoid root fertilization. If plants show signs of nutrient deficiency, applying a diluted liquid fertilizer or micro-nutrient spray in the evening can support their growth without causing stress.
**Shade and Cooling Measures**
Rooftop gardens experience intense sunlight, high temperatures, strong winds, and increased transpiration rates during the summer. This environment can easily cause sunburns, leaf scorching, and dehydration. To protect the plants, it’s essential to take preventive measures early. In early April, install shade nets over greenhouses or use fixed windbreak mesh if there are no greenhouses. For open areas, use external shading nets with a coverage rate of over 70%. When temperatures rise, water the plants both day and night, and mist the leaves several times to increase humidity and reduce heat stress.
**Soil Replacement and Maintenance**
Frequent watering can lead to soil loss, shrinkage, cracking, and a thin planting layer. When the number of potted plants decreases, adding fresh potting soil promptly can significantly improve plant health and growth.
**Regular Weeding and Pest Control**
Keep the potted plants and garden area clean by weeding regularly. Monitor plant health closely, identify any signs of disease or pests early, and implement proper management practices. Timely intervention is crucial for maintaining a healthy and vibrant rooftop garden.
By following these methods, rooftop gardening can become not only feasible but also rewarding, offering a beautiful and sustainable green space even in urban environments.
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