Should You Use Ferrous Sulfate or Aluminum Sulfate for Hydrangea Blueing
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Should You Use Ferrous Sulfate or Aluminum Sulfate for Hydrangea Blueing
Hydrangeas can be blueed with either ferrous sulfate or aluminum sulfate, but the effect of using both together is better. When adjusting the color, dilute aluminum sulfate with water and pour it directly on the plant every 3-5 days, then apply ferrous sulfate to help the hydrangea better absorb nitrogen and phosphorus elements, making the adjusted color more lasting.
1. -- Both Can Be Used --
To turn hydrangeas blue, both ferrous sulfate and aluminum sulfate can be used. When adjusting the color, dilute ferrous sulfate or aluminum sulfate with water, pour it directly on the plant every 3-5 days until the hydrangea turns blue, and note not to apply phosphorus fertilizer when watering.
2. -- Using Together --
Using ferrous sulfate together with aluminum sulfate can make the blue color of the hydrangea more lasting. Since ferrous sulfate can provide the iron element needed for plant growth, it can help the hydrangea absorb nitrogen and phosphorus better. Therefore, ferrous sulfate should be applied immediately after watering with aluminum sulfate. Delayed application may cause the hydrangea leaves to turn yellow.
3. -- Maintenance Management --
When growing hydrangeas, they can be placed in a location with scattered sunlight and good ventilation. In summer and autumn, use a shading net to prevent the plant from being exposed to direct sunlight, which could cause the leaves to turn yellow and burn. In winter, keep the growing environment temperature of the hydrangea above 10 degrees. After spring, the plant can be repotted and fertilized with decomposed cake fertilizer.
4. -- Pruning and Shaping --
In the process of growing hydrangeas, multiple prunings and shaping are required. When the hydrangea seedlings grow to 10-15 cm, you can pinch the tips, cutting off all the axillary buds from the bottom of the plant. When the new branches grow to about 8 cm, pinch the tips again. After the hydrangea flowers, you should also cut off the diseased and old branches to reduce nutrient loss.
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