Yukon Blue'Yukon Blue', an Iseli Nursery introduction, is quite distinctive. The electric silver blue gray needles offer a contrast to almost all other plants, making it very useful in landscape designs. The tree is slow growing and very hardy, to 40 deg F. Faster growing than the more well known 'Conica' so will get up to its mature height quicker. The needles of this Eastern White Spruce are a darker blue and shorter than most of the Colorado Blue Sruce