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About 6 years ago I started a cutting of this hydrangea in a large wooden planter. It seems to to very well in it's high indirect light location. (They do well in Vancouver, Canada).The original was planted about 1912 and was in a very (I assume) acid soil. The area was in a Douglas fir, western red cedar and hemlock native area. I cannot get my plant to be anything other than a dark pink (with some dark purple/bluish flowers). I assumed that this was because of soil acidity. But for years I have been applying Aluminum Sulphate at about twice the normal rate to get the colour to change. Originally I thought that I must have a pH buffer in my soil. However, this still continues. I want to get the blooms to the sky blue of the original piece. When do the buds that are formed in August actually develop the capacity for colour?--in that fall or as they bloom in the spring. I have been fertilizing in the very early spring..but it doesn't seem to help. The aspect is high indirect light/some early morning sun. Any ideas?
