Trees - SpruceColorado Blue Spruce (picea pungens glauca) 
Conifer (cone bearing) tree with distinctive blue-green evergreen needles. The tree color can vary from dark green through all shades of blue-green to powderwhite blue. Prefers full sun.
Norway Spruces:
Norway Spruce (picea abies) 
compact norway spruce - (picea abies 'Minima')
creeping norway spruce - (picea abies 'Procumbens')
Norway Spruce "little gem" (Picea abies 'Little Gem')
Dwarf Norway Spruce (picea abies pumila)
Hedgehog Norway Spruce - (Picea abies 'echiniformis')
Alberta Spruce:
Dwarf Alberta Spruce - (Picea glauca 'Conica')
Dwarf birdsnest spruce / hedgehog spruce (picea glauca 'Echiniformis') 
Dense minature globe with blue gray foliage.
Serbian Spruce:
Serbian Spruce (Picea omorika 'Pimoko') introduced in 1980, is among the smallest of the dwarf forms of this plant. It grows only about an inch & a half a year, forming a foot high, sixteen inch wide domed mound in ten years. As a bonsai with limited resources for its roots & expert pruning, it can remain even smaller. The species has additionally provided weeping forms, skinny upright forms, wide conical forms, prostrate forms, & varieties that are curiously irregular. The spruce needles are themselves miniatures at only one-fourth inch length, densely compact. The needles are grey-green to dark blue-green, having silvery-white stomotal bands. It can make quite a startling contrast alongside a regular dark green or a yellow-green dwarf conifer. It wants rich humusy soil, moist with perfect drainage, & lots of sun, though it can sunburn in particularly lengthy hot days, or windburn in exposed locations during winter.
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