United Kingdom 
We have this growth on a rose bush in our school garden, could anyone please tell us what this is and where it might have come from?
28 Jun, 2011
Answers
it looks like Rose bedeguar gall.. for some more info look on here..http://en.wikipedia.org/wiki/Rose_bedeguar_gall
28 Jun, 2011
Thank you very much for your quick response, have looked at the link you sent and it definitely is what we have here!
28 Jun, 2011
as a kid we called them Robin's pincushion.
28 Jun, 2011
your welcome glad to help..
28 Jun, 2011
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Hi there, that looks amazing
One for the class nature table I recon.
I suspect one of the expert brainiacs will be able to tell you what caused it, I'm guessing it's some kind of gall.
Happy gardening.
28 Jun, 2011