Hi Numbty, I dont know but I have replied so that I can remember this shrub as I just googled it and its stunning, I will have to try and find a place for one.

Hi Marion1,they are very fragrant also!

Can't help you Numbty but neither of my lilacs flowered this year. Not pruned at all as both are quite small.
My white one did start to produce flowers but they fell off and nothing else. I doubt drought. So I'm interested in what others have to say.

Scottish,thank you for your reply, my Lilac was purchased last year and has grown to a good size,just no flowers maybe it is to do with the weather...who knows!