Gardenia old yellow leaves
As a common ornamental plant in courtyards and balconies, gardenia is deeply loved for its white and fragrant flowers. However, novices often encounter thorny problems such as yellow leaves and blackening flower buds when maintaining them. This paper will systematically analyze the causes of the problem and provide operable solutions from the perspective of actual maintenance. Causes of yellow leaves of gardenia and countermeasures 1. Excessive nutrition leads to root burning and excessive fertilization, which is a common cause of yellow leaves of gardenia. When the soil EC value exceeds 2.5mS/cm, typical leaf margins will appear. It is recommended to immediately irrigate with clear water for 3 consecutive times (each time at an interval of 20 minutes) to dilute the concentration of soil fertilizer solution. It can be combined with 0.1% humic acid solution to promote root repair. 2. Imbalanced water management As an acid plant, Gardenia needs to maintain a soil pH of 5.5-6.5 and a humidity of 60%-70%. When there is a lack of water, the leaves will show uniform yellowing. It is recommended to use the "fingertip detection method": insert the index finger into the soil for 2 cm, and replenish water immediately if the fingertip does not sense moisture. In summer, it is necessary to cooperate with leaf spray in the morning and evening to maintain air humidity ≥65%. 3. Ventilation and light control closed environments can easily cause pests and diseases such as red spiders, resulting in star-dotted spots on leaves. It is necessary to ensure that light is scattered for ≥4 hours per day, and the ventilation time of windows is not less than 6 hours/day. Special reminder: When opening windows in winter, you need to avoid direct cold air blowing and keep the temperature above 15℃. Restoration plan for blackening gardenia bud When black rot is found at the base of the bud, immediately use disinfection scissors to cut it obliquely 1 cm below the bud handle. After applying carbendazim powder to the wound, the maintenance environment needs to be adjusted: ·Control the watering amount to 2/3 of normal times·Maintain the night temperature at 18-22℃·Add 0.2% potassium dihydrogen phosphate foliar fertilizer. New buds are usually 15-20 days after pruning, and avoid moving the flower pot during this period. Prevention is better than treatment in daily maintenance of gardenia. It is recommended to establish a periodic maintenance log: ·Measure the soil pH value every month·Apply alum fertilizer water every 30 days in spring and autumn·Regularly rotate the flowerpot to ensure uniform light reception·Spray mancozeb before the plum rainy season To prevent diseases Through scientific water and fertilizer management and environmental control, the annual flowering volume of gardenia can be increased by more than 40%. By remembering the eight-character secret of "applying thin fertilizer frequently, and seeing wet when you see dry", you can keep gardenia green leaf color and bloom with fragrant white flowers.