This tree came from the Arbor Day foundation at least fifteen years ago. We’ve had it in a big pot on our back patio for most of that time. And for the first time, in July 2020, the tree was covered in blooms!
I suspect this is a US native plant, but not the Seattle native C. douglasii. It might be C. viridis. The leaves are smallish and pointed, the flowers very typical hawthorn, and oh–the thorns. There are some respectable thorns along the twigs and branches. I’m hoping for some haws in the fall to complete the hawthorn experience. The plant turns brilliant reds and oranges in the autumn, as well.
My 2020 plans are to keep this tree watered and fed through the summer and watch the autumn color show unfold.