Just wanted to put up a message for those looking for what plant is used for Scenic Express Supertrees. In the kit they are described as such:
SUPERTREES are a natural scale tree form indigenous to the Artic tundra of Scandinavia. A distant cousin to our western sagebrush, their intricate detail and perfect branch structure produce an incredible scale tree unsurpassed in realism.The actual scientific name is Teloxys aristata, also known as Chenopodium Aristatum, seafoam, zeeschuim or wormseed. You can buy seeds for very small cost and grow your own miniature forest. The plant is originally from the Gobi Desert.
Here are some links to more information about the plant.