Caring for Iris After Blooming
Three Key Points of Iris Post-Blooming Care
Deadheading and Nutrient Management
Immediately pruning dead flowers after blooming is a key point of care. Use a sanitized pair of scissors to make an oblique cut 2cm from the base of the flower stem to effectively prevent nutrient loss. It is recommended to remove old leaves and retain 5-6 healthy leaves for photosynthesis. After pruning, apply a slow-release fertilizer containing nitrogen, phosphorus, and potassium (recommended ratio 10-20-10) at a rate of 30-50 grams per square meter, and combine with loosening the soil to promote nutrient absorption.
Scientific Lighting and Water and Fertilizer Control
After the blooming period, ensure 4-6 hours of scattered light daily, and provide shade protection during high summer temperatures. Use the 'moisture-wet' watering method, keeping the soil moisture between 40%-60%. Supplement with decomposed cake fertilizer (diluted 1:50) every 15 days, and from September, increase the application of phosphorus and potassium fertilizers to promote bulb enlargement.
Analysis of the Five Main Reasons for Iris Not Blooming
Imbalance of Environmental Factors
Inadequate lighting is the primary factor. It is recommended to ensure full sun in spring and autumn, and provide 30% shade in summer. The temperature should be stable between 12-25°C, with a day-night temperature difference controlled within 8°C. Maintain the soil pH value between 6.0-7.5, as overly acidic conditions can lead to blind flowers.
Cultivation Management Errors
Burial depth of bulbs exceeding 8cm will inhibit the differentiation of flower buds; the correct planting depth should be twice the diameter of the bulb. Continuous cultivation for 3 years without dividing can lead to aging roots, so it is recommended to divide and propagate every 2 years in autumn. Pay attention to the prevention and treatment of root rot (apply benomyl to the roots) and noctuid caterpillars (apply cypermethrin spray).
Through systematic care management and precise problem diagnosis, the difficulty of iris blooming can be easily resolved. Mastering the three cores of post-blooming pruning, scientific fertilization, and environmental control, along with regular division and renewal, will allow you to enjoy the elegant posture of iris year after year. It is recommended to establish a care log to record data such as temperature and fertilization, forming a personalized cultivation plan.