Here's the spec page from J.F. Schmidt:

Here is a link that might be useful: 'Emerald City'

Thanks, Ken.

If I planted it, it would be some distance away from any structures (~110 feet).

This 'Emerald City' was planted at my workplace in May 2015. It has been fed and watered throughout the summer. Another Emerald donated to a university campus has been watered but not fertilized; it seems to be doing well though the leaves are not as dark as expected for the cultivar.

I expect only 80 to 100 feet from the species lol. 160 is the exception.

Have seen young trees. Just like all tulip trees expect it to get huge in time. Leaves are a nice dark green but not sure if that will hold true for all sites/soils.

the species rarely reaches its maximum and only on the most exceptional of sites like in cove forests

I'd still prefer to have the species. A 55' tree is still huge for a small yard. Anyway, it shouldn't be planted near structures or driveways just for the simple fact it pushes out a ton of sap that would land on cars and shingles. I love the trees though, very elegant. There's never an issue of frost damaging the blossoms here.

Viper's comments remind me of that place in S. Ohio we visited-Seven Caves-which was all karst topography, Canadian hemlocks, N. white cedar....and tulip trees! A most interesting composition for this northerner. Talk about outlier populations.....those Thuja were separated from the rest of their kind by hundreds and hundreds of miles of corn and soybeans. And yes, the tulip trees in that environment were huge.

+om

We've planted a few EC tuliptrees as street trees (I also have one in my yard), but all were planted within the last couple years, so not much to go on yet regarding growth rate, habit, and ultimate size. So far they look like they might be a little more compact than the straight species (the JFS page says "slightly compact"), but I'm guessing once established EC will grow relatively fast (and relatively large). If you want a smaller version of tuliptree, 'Little Volunteer' is becoming easier to find.

I broke a 11/2 branch when we were picking it up At the lowest Branch. Will it graft back together if I use a wide strap or should I cut it off?