Posted: 01/04/2017 at 10:34
Have they had any catkins at all ... the female trees have green catkins which don't have yellow pollen - that's only on the male catkins which grow on separate trees.
Edited to say - yes, when I enlarge your first picture I can see female catkins.
They'll strike really well from cuttings - go into the countryside - really rural area - and find a hedgerow bush covered in male catkins and cut a few small sprigs (I'm sure no one will mind as long as you don't take arms full ) and stick them in some damp ground when you get home. Most of them will grow.
Last edited: 01 April 2017 10:37:54