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Fertilize hydrangeas - How to do it right

Fertilize hydrangeas - How to do it right



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If hydrangeas do not look as beautiful as usual, it may be because they lack the fertilizer. So here's how hydrangeas are fertilized.

Liquid fertilizer for tub hydrangeas

Hydrangeas are one of the flowers that can be found in every garden. No wonder, because they always enchant us with their blossoms and the incredible variety and color variety. There are also varieties of hydrangeas for sale in almost every location. There are some for the blazing sun and also for predominantly shady places. So everyone can get hydrangeas in the garden.

But just planting the hydrangeas is not enough. Hydrangeas must of course also be properly cared for. Since they have a high water requirement, you need your hydrangeas e.g. always water sufficiently. But you should also not forget to fertilize, because this is the only way to fully develop the flowers.

It depends on the pH value

Sometimes gardeners are surprised that their hydrangeas suddenly no longer have intensely colored flowers. Especially with blue varieties it is often noticed that the flowers are rather pink at some point. There is a very simple reason for this: the color of the flowers strongly depends on the acidity, i.e. the pH of the soil. Blue flowers are formed at a low pH of 4 to 4.5, while pink and red varieties prefer a slightly acidic soil with a pH of 5.5. But the content of aluminum oxide also has an influence on the flower color.

If you now change the acidity, you can also change the color of the hydrangea flowers. Pour a little more, then blue varieties keep their beautiful color, while you can change pink specimens into blue. If you then work a little peat into the ground, you can even intensify the effect. A larger amount of water and peat lower the pH of the soil. In addition, you should then give a fertilizer that contains aluminum alum.

If the pH of the soil is optimal, the hydrangea can best absorb the nutrients from the fertilizer. If you want to use a special fertilizer for hydrangeas, you must pay attention to whether it contains aluminum or not if you want a certain color of the flowers. If you want to color the flowers blue, the fertilizer must either contain a lot of aluminum sulfate or a lot of potassium and little phosphorus.

By the way:

The blue color is only successful with red and pink varieties because they contain the dye Delphinidin. White varieties do not have this and therefore remain white.

Properly fertilize hydrangeas

The right choice of fertilizer:

After the pH value had an impact on the flower color, we now turn to the perfect fertilization of the hydrangeas. It is best to use a special hydrangea fertilizer. Alternatively, you can use fertilizers for azaleas or rhododendrons.

Hydrangeas definitely need a fertilizer that contains a lot of nitrogen but little phosphorus. Universal fertilizers are not suitable for hydrangeas because they normally contain a large amount of phosphorus and this is precisely what the plants do not get. If there is an excess supply of phosphorus, blue flowers can turn pink.

The right time for fertilizing:

You need to fertilize your hydrangeas for the first time in spring. The plants growing in the garden should be given a solid consistency. A second fertilization is then necessary in early summer. You should rely on slow release fertilizers.

It is best to always supply hydrangeas in a bucket with a liquid fertilizer. This should be done from March to early August at regular intervals. Once full bloom has been reached, you can stop fertilizing because much less nutrients are needed from now on.