Not yet - but i want to collect one or two. They take partial shade and like damp (they don't like dry roots). They should air layer well enough but their leaves (reducing their size) might be a challenge. There is a closely related species (Sitka Mtn. ash. i believe its called, that grows in the subalpine in the PNW), which naturally has smaller leaves and grows in a more bushy, gnarly form. Might be worth checking out. Cheers.