Hydrangea color adjustment aluminum sulfate and ferrous sulfate (can aluminum sulfate be used for hydrangea for a long time)

When it comes to hydrangeas, many flower lovers will have this question: the hydrangea potted plants they bought had blue flowers when they were bought, but why did they turn pink after re-flowering? How can we make hydrangeas continue to bloom blue flowers?

The little secret lies in the color matching technique of hydrangea. It is not difficult to match the color of hydrangea. We can also match the color of hydrangea by ourselves. When matching the color of hydrangea, we need to do the following 4 things.

Hydrangea color matching tips and precautions

To adjust the color of hydrangeas, we must first understand why hydrangeas can be adjusted in color. The color of hydrangeas has a lot to do with the pH of the soil.

We can use PH test paper to test the pH of the soil. Hydrangeas bloom blue flowers in acidic soil, red flowers in alkaline soil, and in neutral soil, the flowers are usually lighter in color, pink.

1. Understand whether your hydrangea variety has the ability to adjust color

It should be noted that there are many varieties of hydrangeas, and not all varieties will change color as the pH value of the soil changes.

Therefore, before adjusting the color of hydrangeas, we need to first understand whether our hydrangea variety can be adjusted in color.

Generally, the information about the variety will state whether the color can be adjusted. We can look up the relevant variety information based on the variety name.

If you don't know the name of the variety, you can only judge by observing the changes in flower color.

Generally, hydrangeas that cannot be adjusted in color have relatively stable flower colors. However, varieties that can be adjusted in color often have significantly changed flower colors due to different soil environments.

2. Prepare special fertilizer for color adjustment

To color hydrangeas, we need to use special colorants - ferrous sulfate and aluminum sulfate .

Usually, aluminum sulfate is the most commonly used substance to make hydrangeas blue. Aluminum sulfate is a crystal that dissolves in water. Using aluminum sulfate on hydrangeas can not only make the soil acidic, but also provide free aluminum ions, killing two birds with one stone.

However, when using aluminum sulfate, the concentration should be controlled at 1000 times. After it is completely dissolved, water the hydrangea once every 10 days.

Of course, there are also flower lovers who simply use ferrous sulfate or vinegar to adjust the color, but the coloring effect will be better if aluminum sulfate and ferrous sulfate are used together.

When the soil is acidic and contains a large amount of aluminum ions, hydrangeas are easier to color and form a very pure blue color. The aluminum ions in aluminum sulfate are highly active and are very helpful in deepening the blue color of hydrangeas.

3. Find the right time to adjust the color

The earlier you adjust the color of hydrangeas, the purer the blue will be when they bloom. So if you want hydrangeas to bloom pure blue flowers, you can start adjusting the color during the budding period in the spring.

If you are not so demanding on the purity of the color, you can start adjusting the color when the buds appear, but the later you start adjusting the color, the worse the effect will be. If you adjust the color after the buds have grown, the color will often be half blue and half red, and the color will be more mixed.

Flower lovers who have adjusted the color of Hydrangea Endless Summer know that Endless Summer can be adjusted into a very pure blue, and can also be adjusted into a very dreamy gradient color.

The trick lies in the fertilizer and timing of color adjustment. You may try to adjust the pH value of the soil on one side of the same hydrangea pot at different time periods.

The fun of mixing colors of hydrangeas does not only lie in the sense of accomplishment of being able to mix them into blue, but more in the extremely varied colors. Often the colors mixed are not what you originally imagined, but are more dreamy and beautiful than the colors you originally imagined.

4. Stick to color grading

Adjusting the color of hydrangeas is an ongoing process. It is not something that can be accomplished by simply adding a little aluminum sulfate or watering the plant with ferrous sulfate today.

From the day we start coloring, we need to persist until the hydrangea blooms. If you stop using acidic fertilizer in the middle, the coloring will fail, so if you are not prepared to persist in coloring, then just give up from the beginning.

In order to stabilize the coloring effect of hydrangea, you can use slow-release aluminum sulfate in combination with industrial aluminum sulfate and ferrous sulfate. During the germination period, ferrous sulfate should be used to irrigate the roots once a week to adjust the pH of the soil, and slow-release aluminum sulfate should be used in combination.

When hydrangeas grow flower buds, use industrial aluminum sulfate to irrigate the roots once a week. Use it together with slow-release aluminum phosphate. The success rate of color adjustment will be higher and the flower color will be more stable .