How do I stop the needles from falling from our Christmas tree?

I always get a real Christmas tree because I just love the sent of it. I go to a tree lot and pick it out with my sons and they cut it right then and there. But, then the mess starts? Is there a magic trick to keep the needles on the tree. I have tried adding molasses to the water; I have tried planting it in a bucket of soil; leaving the tree outside for a few days for it to settle, basically I have tried all suggestions given to me.

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