How to Fertilize Red Spider Lilies
Fertilizing is an important part of maintaining red spider lilies in the garden. This bulbous plant of the Amaryllidaceae family has specific nutrient requirements, and mastering scientific fertilizing methods can not only promote bud differentiation but also effectively extend the blooming period. Many growers often fall into fertilizing misconceptions, especially when it comes to the use of fast-acting fertilizers like urea.
Three-Stage Management Method for Fertilizing Red Spider Lilies
Dynamic Fertilization Principle During the Growth Period
When the temperature is stable between 15-25°C, red spider lilies enter an active growth period. It is recommended to supplement diluted fermented soybean cake water (150 times) every 14-16 days, combined with a 0.2% potassium dihydrogen phosphate solution for foliar application. The soil should maintain a slightly acidic environment with a pH value of 5.5-6.5, and it is necessary to loosen the soil after fertilization to promote nutrient penetration.
Nutrient Regulation Strategy During the Dormant Period
During the high-temperature summer (>30°C) and the low-temperature winter (<5°C), the plants will enter a dormant state. Fertilization should be completely stopped at this time, and the soil should be kept slightly moist. Special attention should be paid to not using antifreeze fertilizers in winter to avoid disrupting the natural dormant rhythm.
Long-acting Fertilizer Application Skills During Potting Change
When repotting in spring, mix bone meal (5g/pot) and decomposed pine needles (10% ratio) into the substrate. For slow-release organic fertilizers, it is recommended to choose varieties with a release cycle of 3-4 months, and the placement should be more than 3 cm away from the bulb.
Potential Hazards of Urea to Red Spider Lilies
Experimental data shows that applying a 0.1% urea solution can lead to an abnormal increase of 23% in the height of red spider lily plants. Excessive nitrogen can inhibit the differentiation of flower bud primordia in the bulbs, reducing the number of flowers by more than 60%. It is recommended to use a special slow-release fertilizer with a nitrogen-phosphorus-potassium ratio of 1:3:2 as a substitute for urea.
Through scientific fertilization management, red spider lilies can bloom continuously for 5 years. The key is to follow the principle of 'light fertilization during the growth period and no fertilization during the dormant period to nourish the roots,' especially avoiding high-nitrogen fertilizers. Regularly testing the soil EC value (should be maintained at 0.8-1.2mS/cm) and adjusting the fertilization plan based on the plant's growth condition is essential to cultivate high-quality red spider lilies with sturdy stems and vibrant colors.