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Hydrangeas are wildly popular shrubs for their spectacular blooms, with large flower heads in bright blue, pink and white. However, they are also known because it is possible to change the color of their flowers, so that we can choose which colors we want each plant to adopt. Doing it is not as simple as it seems, but with a few tricks it is within everyone's reach.
If you want to know how you can change the color of the hydrangea flowers to vary between blue hydrangeas, white hydrangeas, pink hydrangeas and, in some cases, even achieve an intense tone that reaches red or maroon, keep reading us in this article about Green ecologist showing a guide on how to change the color of hydrangeas.
Is it possible to change the color of a hydrangea?
As we just said, it is possible to change the color of the flowers. The color of hydrangea flowers depends on the bracts that the plant produces around the true, much smaller flowers, and the color of these bracts does not depend on anything other than the soil pH, that is, your level of acidity or alkalinity.
Hydrangeas are plants that usually prefer acidic soils, but they can thrive in a wide range of pH ranging from approximately 4.0 to 8.0, leading to different colors in these ranges.
In addition, it is important to note that experiments changing the pH of the soil must be carried out at least 60 days before flowering and that any subsequent changes will no longer have the desired effect on the plant.
If there is a case of loss of color in hydrangeas, it is likely that they need more nutrients or that the pH is changing. Additionally, the different varieties of hydrangeas have different natural colors. Although it is possible to modify these colors by altering the pH of the soil, the ideal thing will be to provide them with an acidic soil, which is also the best way to how to enhance the color of hydrangeas.
How to change the color of hydrangeas to white
Some hydrangea varieties bear white flowers in itself, but it is possible brighten pink or blue hydrangeas to the point where its flowers are almost white.
However, to achieve this it is necessary raise soil pH up to nothing less than a value of 8.0, which can also result in a large number of complications for the plant, being common that we see cases of iron chlorosis appear, which can end up leading to serious health problems for the plant.
Obtaining white flowers from other pinks or blues is not impossible, but it is very risky and difficult and, therefore, not recommended, since it is not the natural or optimal state of the plant, so it is better to directly acquire a plant of white variety.
How to get blue hydrangeas
To get the hydrangeas back blue, or if you are simply looking how to keep hydrangeas blueThe first and most basic step is to get a pH below 5.0, which is the acidic soil that these plants usually need.
To make the earth acidic you can use vinegar for hydrangeas, citric acid or iron sulfate. Once the pH is below 5.0, we can add the homemade hydrangea blender, which is nothing other than aluminum sulfate. It is enough to dissolve 2 grams of aluminum sulfate for each liter of water, and water with this mixture once every 3 days for two months before flowering. If the pH is not kept acidic enough, or the plant does not have enough aluminum, we will surely have hydrangeas that lose their color.
We recommend you read this other post about the question: Is vinegar good for hydrangeas? We also advise you to know the Care of blue hydrangeas with this guide.
How to make hydrangeas pink
The pink hydrangeas are the most common to see, since when a hydrangea with another natural color is watered with tap water, which usually has a high content of lime, the pH of its soil loses acidity, reaching the point where it rises above 6.0 and the hydrangea flowers eventually turn pink, even if it was not the natural shade of their variant.
It is possible to increase the soil pH by adding calcium nitrate, paprika, or wood ash to get the hydrangea to give pink flowers, but keeping it in this state for a long time is not recommended and will endanger the health of the plant, which could suffer chlorosis. You can also use fertilizer rich in nitrogen and phosphorus and low in potassium, as well as copper sulfate or phytochrome, a natural colorant that is quite difficult to obtain.
For all this, again, it is advisable not to extend the treatment for a long time to avoid damaging the plant and, if we really want one, in this case, pink, it is best to buy the variety of this tone.
How to get garnet hydrangeas
To avoid the loss of color in hydrangeas that occurs whenever the soil pH rises, it is possible to add hydrangea bluish, that is to say, aluminum sulfate, but keeping the pH around 6.0 or 6.5. This will lead to red hydrangeas or garnets, or rather a very intense pink, so intense that it can look like this. As always, the hydrangea will end up needing acidic soil to grow healthy, so these practices should not be maintained for a long time in the same plant.
Now that you have known all this about these plants and the change in the color of their flowers, we encourage you to read our guides on it:
- How to plant hydrangeas.
- Hydrangea care.
- How to care for potted hydrangeas
- How to reproduce hydrangeas.
- How to prune hydrangeas.
If you want to read more articles similar to How to change the color of hydrangeas, we recommend that you enter our category of Cultivation and care of plants.
