Answer: Here are a couple of suggestions:
Picea glauca 'Conica' (Dwarf Alberta Spruce) which grows in a pyramidal shape to about 3' tall. Picea pungens 'Glauca Globosa' (Dwarf Colorado Blue Spruce), which grows 3-4' tall, or the extremely slow growing Picea orientalis 'Nigra Compacta' (Compact Oriental Spruce).
Hope one of these is just right for your garden.
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