The one definitely native poplar is aspen (all other poplars may be assumed to be introduced, although the black poplar is still being argued about).
Aspen will grow into a full sized tree. The leaves make a distinctive sound as they rattle gently in the wind, and they have a sweet smell in the spring.
Aspen can be found in wet areas and around lake edges such as in Glenveagh, Co. Donegal.
Poplars produce seeds on catkins, but also spread vegetatively by suckers i.e. new shoots growing up from the roots. It is easiest to propagate aspen by cutting through roots and transplanting a sucker.
A warning should be given about planting aspen in damp sites with good soil. They sucker very readily and may spread too far, taking over too great an area. Choose aspen if you don’t mind an invasion!