X-mas tree buds? What a silly name. This is a shot in the dark, but they could mean that the weed is piney smelling perhaps...? Nothing wrong with that stuff. It's all over the place here.

Or he could mean in reference to a certain strain of cannabis that resembles a x-mas/pine tree. It is known as Ruderalis. It is uncommen but they grow very small, and resemble well, a x-mas tree. It is found in a strain known as Lowryder. It is uncommon, due to it's mid-quality potency. You can grow it under the best conditions, it will come out mid. smoke.

Whatever though. I'd ask them where they pulled such a funny name "out" of.