What Causes the Drying of Rose Leaves
As a common ornamental plant in courtyards and balconies, the condition of rose leaves directly reflects the health of the plant. When the tips of the leaves become crispy and the leaf surfaces turn yellow, it often indicates that there are maintenance issues with the roots or the growing environment. This article will systematically analyze the causes from five core dimensions and provide practical solutions.
One, Three Main Causes of Rose Leaf Lesions
1. Imbalance in Water Management
Overwatering is a common misconception in potted rose care, leading to waterlogging and preventing the roots from breathing, which causes root rot. Typical symptoms include the new leaves turning yellow and wilting first, and moss visible on the soil surface. It is recommended to use the "wet-dry" method, watering every 3-5 days in spring and autumn, and twice a day in summer but controlling the amount of water per watering.
2. Improper Light Intensity
Although roses enjoy sunlight, more than 6 hours of direct sunlight can cause leaf burn. This can be observed by the brown edges on the leaf margins, and in severe cases, the entire leaf will curl. It is suggested to use a shade net to filter 30% of the light between 10:00-15:00 or move the plant to an east-facing balcony to receive morning sunlight.
3. Disruption in Air Humidity
When the environmental humidity drops below 40%, the leaf transpiration intensifies, leading to dehydration and yellowing. Prevention can be achieved using the "three-degree monitoring method": initiate humidification measures when the temperature exceeds 28°C; mist in the morning and evening when the hygrometer shows less than 50%; and stop补水 when the soil humidity reaches 70%.
Two, Systematic Preventive and Control Solutions
1. Soil Improvement Strategy
Use a mixture of pearl rock, humus soil, and vermiculite (1:2:1) as the growing medium when repotting to ensure good water permeability and aeration. Supplement with 5g of slow-release fertilizer every quarter, maintaining an EC value between 1.2-1.8mS/cm.
2. Environmental Control Techniques
Build a mini greenhouse: use a transparent storage box upside down to form a humidity cover and ventilate for 2 hours daily. Install an automatic misting system, set to mist for 15 seconds every 3 hours to maintain humidity between 65%-75%.
3. Nutritional Supply Plan
Apply chelated iron foliar fertilizer (concentration 0.02%) at the early stage of yellow leaves, and use water-soluble fertilizers containing humic acid. Use EM bacteria solution to water the roots every 10 days to promote root repair and regeneration.
By establishing a complete maintenance loop of "observe-diagnose-intervene" and using smart temperature and humidity monitoring equipment, the incidence of yellow leaves in roses can be reduced by 80%. Regularly pruning diseased leaves, maintaining proper ventilation, and scientifically supplementing trace elements can help the plant maintain a healthy growth state.