rockm

Although Stray doesn't give his location, I would bet it's somewhere in N. America. This is most probably Eastern Red Cedar (juniperus virginiana) which is a juniper not a cedar. It's a "weed" tree that will sprout anywhere. It is a very fast grower and an opportunistic one.

They can make good bonsai, but mostly only in the hands of someone who's had years of experience and originating from older larger stock chopped down to bonsai size. As saplings, they are almost always lanky and loose and pretty mediocre bonsai material.

Vance Hanna has an excellent one that he's developed over decades.

Since the Red Cedar does indeed produce "mature" awl-like foliage and the spikey "juvenile" foliage, it can be difficult to keep. Too much pruning, fertilizer, water, etc and the plant reverts to the spikey growth. It's a pain.