Things You'll Need
Turkey baster or wet/dry shop vacuum
Keeping water in your Christmas tree stand helps keep your tree looking fresh and green throughout the holiday season, as well as preventing dry needles from dropping off on your carpet. While it's not a common problem, it's possible that contaminants and/or bacteria in the water can lead to a foul odor. The easiest remedy to try is to remove the offending water and replace it, leaving the tree in the stand throughout the process.
Remove the water from the stand using a turkey baster or a wet/dry shop vac with a narrow nozzle.
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Wipe out as much of the interior of the stand as possible, using paper towels, to remove any contaminants.
Mix 1 to 2 tsp. of baking soda into a quart of clean tap water. Use this water to refill the tree stand.
Before putting up the tree, clean the interior of the stand using soap and water to help prevent contamination and the resulting odors.
Do not use fertilizer or plant food in your Christmas tree stand. Your tree shouldn't require fertilizer over the holiday season, and many fertilizers can cause odors.
Do not add bleach or any other cleaning agent to the water in your Christmas tree stand. Bleach can harm the tree, leading to brown, dry needles.