Has your shrub flowered yet @bpowell ? Could you cut a stem and see if they actually are hollow? I think Nandina shows a lot of colour in the leaves. Do you know if your soil is acid or alkaline?
Have a look at this. Although the opposite leaves remind of Forsythia, I have a feeling that this might be a Euonymus Alatus. I believe they are quite common in your part of the world. What do you think?
Stems of this shrub are square with ''wings''
I agree, this is Winged Spindle (Euonymus alatus), in the Bittersweet Family (Celastraceae).
Also known as Burning Bush, this attractive deciduous shrub is native to China, Far-eastern Russia, Korea, Sakhalin, and Japan. Euonymus take well to pruning. I recommend using precise thinning cuts to reduce the shrub's size, rather than blunt hedge cuts.
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