Platycladus orientalis 'Aurea Nana' / Berckmann's Golden Arborvitae

(Obrizok) Thuja orientalis 'Aurea Nana': Dwarf, globose, dense erect flattened foliage, golden yellow summer foliage.

From experience, I've found this Genus and species to grow without harm in zone 5a, midwest Illinois. These conifers are widely planted here.

Platycladus orientalis
Photo by Sandra McLean Cutler
Platycladus orientalis 'Aurea Nana' Photo taken at The Gotelli Collection of The US National Arboretum during May 2006; Washington, D.C. Thuja orientalis is the correct designation.
Photo by Dax Herbst