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Oh cool.. hah yeah I see the wheelbarrow full of cuttings
They probably spread by runner unless they are really far away.
Maybe Mason Bees will pollinate them. Normally they flower really early before honey bees are really active. So solitary bees may like them as they start much sooner.
I think the flower's shape prevents bees from getting to the pollen...
It takes a certain moth that lives only in Africa - without looking this up...
Anyways, apart from the usual runners, I sometimes pull out whole forsythia with their own little root system and no attachment - also as you said - quite far across the garden.
It's hard to tell... I now have 7 or so bushes in total...