Blue hydrangeas, how to do it

Blue hydrangeas, how to do it

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Blue hydrangeas, how to doto obtain the desired color. Care and advice for growing blue hydrangeas and pink hydrangeas.

With the increase in temperatures, the period offloweringofhydrangea… But how to get flowers with an intense blue color until they migrate towards blue? It's all a question of pH! On this page we see how to obtain hydrangea coloring you want starting right from blue color - lively blue.

Hydrangea, cultivation

Therecultivationofhydrangeais simple. These flowering shrubs are very popular in Italian gardens precisely because they are easy to maintain and grow, both in the garden and in pots.

With flowering, they give abundant inflorescences with a color that varies from white, pink, violet, mauve, light blue and blue. Varieties ofhydrangeaswith mottled flowers and petals with jagged edges, despite the latest news, thehydrangeasthe most widespread and most desired are those with flowers with blue - blue petals.

Hydrangea coloring

Hydrangea is a plant strictly dependent on pH. Azaleas, camellias, magnolias, heather, jasmine, mimosas… are basically acidophilic plants. They grow well in semi-shaded and cool locations and especially bloom with more vibrant colors if the soil pH does not exceed 6.5.

It is the reaction of the soil that influences thecolorof theflowering of hydrangea. When the hydrangea is grown in acidic soil, it gives rise to bright blue or blue flowers, while if the soil becomes alkaline the color of the hydrangea goes towards pink.

Blue hydrangea, how to get and maintain the blue - blue color

If you have bought ablue hydrangeaand after a year, the same plant has given you back a purple or even pink bloom, don't worry ... don't forget, the flowers were really blue when you bought the plant!

What happened? The potting soil was at an acidic pH and so the flowers of thehydrangeathey were blue or very deep blue. Transplanting thehydrangeain your garden, the reaction of the soil has changed and the coloring of the flowers has been affected.

The same thing, similarly, could have happened even though you continued oncultivate hydrangea in pots: if you have irrigated the plant with tap water (calcareous), the soil pH will have begun to alkalize (the calcareous water increases the pH of the soil, which is no longer acidic but basic) and so the flowers will migrate towards the shades of pink.

With this premise you can understand that:

  • a'hydrangeapink can be transformed into ablue hydrangea
  • a'blue hydrangea can be transformed into a pink hydrangea

It all depends on how you treat the soil.

Blue hydrangea, how to do it? To bring back thehydrangeato the original blue color or formaintain a blue hydrangeaall you have to do is stabilize the pH of the soil at a value below 6.5. At this juncture, in addition to following the advice on this page, we invite you to read our other guides:

  • How to check the pH of the soil
    Just buy a kit on amazon, some litmus papers that can be bought with about 5 euros. You will have to wet these papers with a solution of demineralized water (the one used in the iron) and soil.
  • How to increase the pH of the soil
    This guide can help you if you prefer light hydrangeas, then pink, light purple hydrangeas ...
  • How to lower the pH of the soil
    As stated, a pH value lower than 6.5 returnsblue hydrangeasor intense blue.

How to get blue hydrangeas

To correct the pH reaction of the soil, you can irrigate hydrangeas with rainwater and use some products that contain aluminum (aluminum sulfate), iron (iron chelate) and other microelements that tend to raise the pH of the soil.

These products must be diluted in water and administered at the doses recommended on the label. To get an idea of ​​the price and where to find these products, we refer you to our useful link: Bleaching products for hydrangeas.For smart and effective use, avoid irrigating hydrangeas with tap water if not donerestin a basin for at least 24 - 48 hours. If you are not planning to spend money, you can take advantage of techniquesdo-it-yourselfforget blue hydrangeas.

These cultivation techniques are not very reliable because they could give you back a hydrangea that will start producing different flowerscolors: even the same inflorescence could carry pink and blue flowers. At the base of the plant you can place lots of iron nails or, even better, iron filings: penetrating into the ground it will be absorbed by the plant which will begin to produce blue flowers.

This remedy is only temporary and its effectiveness depends on the plant's ability to absorb the nutrients of the soil (including iron). With this DIY remedy, be sure to associate all the tips foracidify the soilthat we have given you with the guidehow to lower the pH of the soil.

You might also be interested in

  • Muscari: flowers and cultivation
  • Iron filings for plants

Video: Hydrangea Care Old and New Growth (May 2022).


  1. Tayte

    Exactly! Good idea, I maintain.

  2. Kern

    And how in such a case to enter?

  3. Michael

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  5. Osric

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