Fine in a park or garden, but sad to say this group of plants is bad news for British Wildlife:
http://www.countrysideinfo.co.uk/rhododen.htm
Lots more info to be Googled...
Roger
I used to do a lot of rhodi bashing with what was the BTCV.
And pine bashing. The list goes on.
And I won't get you started on daffodil cultivars Roger.
Nick
Vale of the Great Dairies
South Dorset
Elevation 60m 197ft