By Boldstreeter
Lancashire,
United Kingdom 
I've got white blobs on my Hydrangea. It's not affected it flowering, but it can't be right. I live in the North West of England.
12 Jul, 2014
Answers
Thank you for that, do you know the best way to deal with this problem?
12 Jul, 2014
I'd say Hydrangea scale, here's a link to the information available on RHS website.
http://www.rhs.org.uk/advice/profile?pid=557
copy and paste into your address bar. Alteratively search for Hydrangea Scale and the RHS page is top of the list (in google that is)
12 Jul, 2014
Agree with Scottish, hydrangea scale it is...
13 Jul, 2014
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They look like wooly aphids and will cause damage so need to be dealt with.
12 Jul, 2014