hydrangeas color changing

lsevernsJuly 9, 2010

I purchased a blue endless summer hydrangea last year and had the most beautiful blue flowers. During the season last year it started to bloom pink flowers. I purchased alum. sulfate and added 1T with a gallon of water this year in the spring and 1T with water in July. I have two blooms that are starting which are now pink. How often and how much should I added alum. sulfate to change it to blue?



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luis_pr(7b/8a Hurst, TX)

I would look at the directions on the package to see how frequently they recommend you reapply. I would also consider purchasing a soil pH Kit that gives the results in a numeric scale so you can better monitor the pH Levels. If the package does not give good directions, you can try applying it monthly (while the ground is not frozen) and write down the soil pH Kit's results down in a wall calendar so you can monitor your progress.

    Bookmark   July 10, 2010 at 4:32AM
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After some trial and error I had good luck keeping my endless summers blue. One bush I planted in a giant plastic pot that I buried (the bottom was cut out of the pot) this way I could change the the ph without affecting anything else.
The other I initially had the same problems you are having so I just mixed a lot of the alum sulfate in the ground around the root ball I must have put at least 1/2 cup if not more. This worked great and doesn't seem to bother the plants around it. From what I've heard it is fairly difficult to change the ph of soil so I figured I would use more than the amount on the pkg and its worked great for me.

    Bookmark   July 12, 2010 at 8:38PM
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morz8(Washington Coast Z8b)

Tricia, you may have been lucky. Using more than the recommended amount of a product is rarely a good idea...better to become fond of pink flowers when you prefer blue than to kill your shrubs.

Here is a link that might be useful: Previous thread, too much aluminum sulfate

    Bookmark   July 13, 2010 at 11:01AM
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it is funny how we all want blue flowers and pink is so pretty too:):)
I love blue too but I sort of let it do its own thing

    Bookmark   July 13, 2010 at 8:35PM
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