Changing Pink Hydrangea to Blue Flowers

03 Jun

Hydrangea macrophyllas are spectacular in bloom and are show stoppers within the landscape. Pink or Blue, this early summer blooming shrub will last for weeks.

People are always wanting the hydrangea color they do not have. It is much easier changing the color from pink to blue rather than vice versa. So take a good look at your lovely hydrangea plants and determine if the color is appropriate for the space. The two hydrangea shrub pictures are of the same plant, but installed in 2 different locations.

This large hydrangea shrub, probably Nikko Blue, has bloomed this color for many years. 2 years ago a cutting was taken and planted on a different property. Below is the bloom of the cutting.

Quite a difference in color.

Absolutely fabulous that from one plant 3 or 4 different shades of pink/lavender/periwinkle can be enjoyed.

How do we go about changing color? First, the change from pink to blue. These amendments can be added to the soil to increase acidity or lower the pH number:

  • peat moss
  • ammonium nitrate
  •  ammonium sulfate
  • sulfur coated urea
  • iron sulfate

Pink hydrangeas favor a high phosphorus content and a more alkaline soil with a higher pH, try adding:

  • dolomitic lime
  • ginger
  • kidney beans
  • calcium
  • sand
  • baking soda
  • fertilizer such as 25/10/10
  • ripe bananas
  • planted by a concrete walkway or garden ornamentation (lime from concrete leeches into the soil)
  • mix 1 tablespoon vinegar with 1 gallon of water

Hydrangea macrophyllas can be used as filler plants, foundation plants, hedges or for cutting flowers, especially weddings. They prefer morning sun only and like a good drink of water each week. So if you do not have an irrigation system, plant your hydrangea by the house in close proximity to a water source.

Happy Planting!

Diana Gardner-Williams

Landscape Design and Installation


Posted by on June 3, 2010 in Favorite Plants


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3 responses to “Changing Pink Hydrangea to Blue Flowers

  1. Beth

    June 8, 2010 at 8:08 pm

    I loved the hydrangea article! They are some of my favorites! especially since my Great Grandmother had a HUGE blue one in her5 yard growing up!

  2. Lori

    June 26, 2010 at 5:32 am

    This got generated as a “related post” on an entry I wrote complaining about my blue hydrangea turning pink.

    So, since my plan involves making my hydrangea depressed and thereby returning to to its blue color, I decided to read your post and see perhaps if it was a little more…I dunno…”rooted” in reality, so to speak.

    Very helpful, thank you!

  3. Trish - Storage

    July 26, 2010 at 8:44 am

    your blog is too fine. Thanks for sharing this



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