My Allee II makes a modest effort to turn yellow-reddish very late in the season. Actually not bad compared to most trees on my lot in a frost hollow. Blooms in autumn. It's quite upright, but lately arching outward a bit more. Fast -- 30+ ft on its ninth season. Very nice tree, but it does need room.

beng, would you mind posting a pic?

Alas, whaas, my old digital camera is kaput. I need to get a new one...

Article on Chinese elm:

Here is a link that might be useful: Chinese elm

What does 'Bosque' look like? Google image search shows it looking almost Zelkova-like at maturity, vs the vase shaped 'Allee'.

Bosque looks nice. Quite upright, but my Allee II looked similar at that size. Recently it's growing outward more, which is desirable for its location and intended use. I have had to trim off a few branches that were arching sideways at eye-height.

Whatever you like, get one. Mine's already shading the west side of the house in the hot, late summer afternoons. And looking out the window now, it's still green between a bare sugar maple & black cherry.

So growth rate is pretty fast, beng?

5 to 6 ft shoots every yr, but at the top splay outward, so total height doesn't increase quite that fast. It grows continuously from spring to early fall on the vigorous branches. Added attraction right now is massed seeds along the twigs. Honeybees love the late-summer flowers for their pollen -- never noticed that w/any elms before.

Even though they bloom in fall, they seed enough here that I've had a pull out several seedlings. I figured that's going to be true of many ornamentals. Heck I've had to remove Hemlock and Yew seedlings. There are so many ash and maple seedlings, even > 75' away from any ash or maple, I figured the Chinese elm seedlings will just get "lost in the noise".
Still if you keep a very neat garden, something to be aware of. I know someone in New Jersey who cut one down because he was tired of the seedlings.

Here's the flowers of the Chinese Elm, pic taken a couple of days ago. As mentioned earlier volunteer seedlings can be a problem. The owner told me that he plans to remove this tree for that very reason.

There are Ulmus parvifolia where I work, zone 5b. They had a lot of twig dieback after a hard winter this year, and they seem to in general create a lot of seedlings. While the bark is pretty in winter, I don't plan to add this tree to my yard based on those two factors. It might work better in a different setting, but I have enough invasive species without adding one more potential invasive.

Sam -- mine's flowering. Last yr there was an amazing hum of hundreds & hundreds of honeybees collecting pollen. This yr I haven't heard or seen a single one.

Only one in the area, so never has viable seeds.

It's funny though, since I've posted that, the seed problem I expected still hasn't happened. The tree is much bigger than it was back then, as beng says, they do grow fast. Yes, I do have to pull a couple or so each season. But this is nothing compared to the HUNDREDS of ash or maple seedlings I have to pull or spray with roundup! So maybe my tree is having trouble pollinating itself, or something. I doubt there are many around here, much too fancy a tree for rural Cecil County LOL.

So, to respond to whass' 2 yr-old request above, after buying a decent digital camera (pic taken last fall).

Its branches are beginning to seriously compete w/the black cherry to the right (out of view). But B cherry is no pushover: