The basic fertilizer is usually mixed into the substrate when Rhododendron is planted or changed, and the compound fertilizer with balanced proportion of N, P and K is usually selected. Fertilizer should not be too thick, because at this time plants need to slow seedlings, thick fertilizer will be harmful to its growth, so before use, it should be diluted.
Before flowering, sufficient fertilizer can increase the number of flowers and help the quality of flowers. At this time, phosphate fertilizer is the main fertilizer and a small amount of potassium fertilizer is added to improve the resistance of plants. Less or no application of nitrogen fertilizer, or it will make it grow in vain, has an obstacle effect on flowering.
Generally, fertilization is not needed in the flowering period. At this time, it will absorb the nutrients in the soil and do not need extra fertilizer. Improper fertilization is likely to shorten the flowering period and even wither the flower buds.
After anthesis is another important period of fertilization. Because Rhododendron will consume a lot of nutrients when it blooms, it needs to be supplemented with some nitrogen fertilizer. In summer, it enters the semi dormancy period, at this time, fertilization is not needed. But from August to September, it will return to growth. At this time, phosphate fertilizer will be applied every 15 days. Stop fertilizing after winter
