Mine is about 6' tall. I'm training it to have three leaders - not sure if you can see that in the pic below. I got it very small - about four years ago.

I also have a red-leaved cultivar called 'Red Fox'.

Here is a link that might be useful: Cercidiphyllum japonicum 'Pendulum'

Has been prevalent on the retail market here in the past. Mine made an elevated table about 12'-15' across before being overwhelmed by a rose, which I think has now killed it.

I'd rather have C. japonicum 'Morioka Weeping' (C. magnificum 'Pendulum') as that has apical dominance, grows up to make a much more impressive tree in the manner of Fagus sylvatica 'Pendula'.

Here's a couple for you. First is growing in Chicago area, second one is growing in Milwaukee area. I'm not 100% sure if the Milwaukee plant is Pendulum or a different cultivar as it wasn't labeled.

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Ooh I can't wait till mine gets bigger! Thx for the pix.

Mine, as it looked in August of this year. A lovely tree but the leaves never smelled of cotton candy/burnt sugar in fall. How does your smell?

The 'Pendula' never smells like burnt sugar. I have two straight species that do, but the mature ones at a local botanical garden (20-25 years old) have a much more pronounced smell. Of course it gets hotter over there and that could be part of it.

The Chicago and Milwaulkie trees are elevated enough to be 'Morioka Weeping'.

I supposedly have this from Forestfarm, but at 20+ ft & healthy, it shows no sign of weeping -- nothing like the above trees. Oh well...

beng - sounds like you've got the straight species. When I bought a dozen Nyssa sylvaticas a while back, in #15 cans about 5' tall, they all looked the same. Then they grew and two turned out to be weeping. Mercifully I was not looking for a symmetrical effect...
Sometimes things get mis-labeled in nurseries, esp when they are small.

The one upright Katsura tree might be the rootstock.

Oh yeah I bet that could be right!