How long after a tree is cut do you need to put in water?

After a tree is cut, it's important to place it in water as soon as possible to keep it fresh and prevent dehydration. Ideally, this should be done within a few hours of cutting. If it's a freshly cut Christmas tree, for instance, it should be put in water immediately and kept in water at all times to maintain its moisture and prevent needle drop. If left out for too long without water, the cut end can seal over, making it harder for the tree to absorb water later.