Dwarf spruce Picea glauca Conica - Mini Christmas treeEvergreen and hardy! That is the dwarf spruce (Picea glauca) in a nursery pot. The dwarf spruce is green and yet the Picea glaucea is also called 'white spruce'. This conical dwarf conifer is rather petite. Its needles are short and remain green all year long. The conifer should be planted in the garden or in a spacious pot or planter. The Picea glauca in a pot makes an excellent Christmas tree. Nice and durable! The Picea glauca is easy to maintain.