A Den nobile hybrid?
I find them to be very aggressive growers. And I have heard of keikis blooming on them as well. But it is always cool to see. I have had great success harvesting these keikis and having them thrive. I sent a couple different types potted up to BD earlier in the year.
My Dens just went to winter rest and I can see new leaves growing on 2 of the Den superbum newer canes. All of them look very happy so far (1 week in the garage). Last year all grew lots of roots during the rest.