This is a little whichbroom from a platanoides.Very dense foilige small, petite ,slightly curley leafs. Hardiness as Platanoides.
Sorry ,just bought it,i doesn´t have any more info yet.what do you want to know? i can try to get more info.
Sorry for the late update just forgot.The origin of nowush is still unknown but it seems that some plantstores in poland has it and several in sweden.Mine has grown nicely (for a whiches broom)during the summer.I did not get any fall color this year.Picture from late summer.