I would guess that I prune the evergreens in my yard back 6 inches in the spring. A long and wild stem on a yew, I may prune back 16 inches. Do I prune in November? Never. But there are those farmers out there that grow evergreens with the idea to cut for the holiday season. Long trimmings grace no end of winter pots and garlands. Our premium greens come 25 pounds to a case. Each bough averages 18 inches in length. We appreciate an emphasis on long and green for our winter and holiday projects. Greens of lesser quality are more about the woody trimmings, than the greens.
Florists greens are really short. A centerpiece on a table needs much less in the way of length and volume than a winter container. My advice- go for the long boughs. I am appreciative of how many materials are available to me. Any creative expression friendly to the garden begins and ends with what nature provides. The evergreen boughs that will bring your holiday to life are brought to you by the farming community. Do what you can to support them.