We also now have available two more species: Concolor Fir and Canaan Fir. The Concolor Fir is an elegant tree with silver-green soft foliage. The medium length needles and pleasing branch habits make this a most attractive Christmas tree. The Canaan Fir is closely related to the Balsam Fir, with short, soft needles that tend to be medium to dark green on the top, and silverish-blue on the underside. This tree is gaining in popularity because of its open-growing patterns and strong branches.