How trim colorado blue spruce evergreens?
Blue spruce grows best in Colorado. As is the tendency with evergreens, it’s picky about pruning. So given the two preceding conditions, it’s best off just being pruned of damaged, dangerous, dead, decaying, diseased parts. Best pruning time’s early spring. No more than half of new growth should be pruned. All pruning cuts must go back to about 1/4″ from either the trunk, or from something green [bud, needle, side branch].