On 04/05/2014 14:00, Frank Booth wrote:
"Mick" wrote in message
...
Hi all,
I split and transplanted a Hydrangea two years ago, it did not
flower last year, but does have flower buds forming this year.

Is there anything I can dress the ground around them to get blue
flowers please?

You need to make the soil more acidic (pH 7). There are various ways you
can do that,. I use sulphur powder, although that takes a few months to
work, and the soil needs to be reasonably warm, so currently is a good time
to be doing this.

If you have a naturally chalky soil you might end up having to dig in a
couple of kilos to make any difference But I've seen chemical packs in
garden centres specifically designed to turn pink hydrangeas blue Not used
them myself but presumably they operate on the same principle.




A Blue hydrangea that has turned pink because of the wrong ph level will
revert to blue once you can reduce the soil alkalinity.
In the old days they said to bury rusty nails under the plant.
See http://www.rhs.org.uk/advice/profile?pid=122