At great age, ERC will develop scale foliage. Generally we see ERC with the sharp juvenile foliage.
It is on my list of difficult to work with bonsai. Normally I'm an optimist, hell, at 64 years old I'm regularly starting trees from seed. ERC is difficult enough that I won't bother trying to work with one any more. I won't live long enough. Got better projects going.
Just about any other species of juniper is easier to work with. ERC is not completely impossible, if you find a nice enough trunk, and feel confident, go ahead and try, but if you want a nice bonsai tree in your lifetime, I would pass on ERC.
ERC seedlings, for a brief period of time, might be okay in a forest planting, or some sort of less formal accent plant. The autumn & winter color might work well mixed in a grass planting, where the tree is not the focal point. But as a specimen tree, they never make the grade for top shelf bonsai.
They are iconic easter North American junipers, my nephew in 2013 with an ''reputed'' to be 800 year old ERC on a vertical sandstone bluff in southern Illinois. It has scale foliage. For those who think Illinois is all flat cornfields, you are mostly right, but get to the Shawnee National Forest, and you actually do have hills, bluffs, and ''hollers''. Yes in southern Illinois, ''holler'' is a noun.
