When to Fertilize Roses
Roses are被誉为 the queens of flowers, and proper fertilization is the key to cultivating high-quality flowers. Mastering scientific fertilization methods can not only promote robust plant growth but also significantly improve flower quality and blooming quantity. This article will systematically analyze the fertilization secrets for rose maintenance, from fertilization timing, fertilizer type combinations to operational precautions.
The Golden Period for Fertilizing Roses
Spring Growth Period (March-April)
When the temperature rises to above 15°C, apply diluted animal manure water mixed with compound fertilizer at a ratio of 1:10, controlling the dosage to 200-300 grams per square meter to awaken dormant roots and promote the germination of new buds.
Before Bud Formation (20 Days Before Flower Harvest)
Use a fast-acting liquid fertilizer with a nitrogen-phosphorus-potassium ratio of 3:1:2, combined with decomposed soybean cake water for foliar application, with the concentration kept within 0.3%, which can effectively extend the flowering period of a single flower by 5-7 days.
Post-Flowering Recovery Period (Late May)
After pruning the spent flowers, promptly supplement with organic fertilizer. It is recommended to use a solid fertilizer mixture of sheep manure and bone meal in a 3:1 ratio, applying 200 grams per plant in circular trenches to promote lignification of new branches.
Scientific Ratio for Rose Fertilizer
Preferred Organic Fertilizer Option
Decomposed farmyard manure (cow dung is best) mixed with wood ash at a ratio of 5:1, rich in potassium, can enhance the plant's disease resistance. It is recommended to apply 8-10 kilograms per square meter as a base fertilizer in winter.
Precise Chemical Fertilizer Dosage
Fast-acting compound fertilizer should be selected according to the standard N-P₂O₅-K₂O=15-15-15, applying no more than 50 grams per plant per month during the growth season to avoid soil salinization and alkalinization.
Microelement Supplementation
Applying a 0.1% borax solution before flowering can enhance anthocyanin synthesis, and combining with EDTA chelated iron foliar fertilizer can effectively prevent yellow leaf disease.
Rose Fertilization Operation Standards
After fertilizing, immediately water thoroughly to set the roots, using the circular trench method to ensure even root absorption. For potted roses, it is recommended to use slow-release fertilizer capsules, changing them every quarter. Always avoid fertilizing on rainy days and perform it in the evening during hot seasons.
By mastering the application rules of three seasons and four fertilizers, combining the scientific ratio of organic and inorganic fertilizers, and using the correct fertilization techniques, the rose plants can maintain vigorous vitality. Regularly test the soil EC value (recommended to maintain between 1-2 mS/cm) and adjust the fertilization plan flexibly according to the plant's condition to cultivate high-quality roses with large and colorful flowers.