Opinions vary when it comes to the usefulness of an aspirin tablet in your Christmas tree's water. Some swear that it keeps it fresher longer, but Christmas tree experts at the National Christmas Tree Association state that there is no evidence supporting this notion. They do, however, offer other tips for keeping your Christmas tree fresh.
Buy a Fresh Tree
The National Christmas Tree Association recommends buying a tree within three to six hours of its being cut. After this time, the pores in the tree's stump will allow air into the tree, reducing its ability to absorb water. However, since many people purchase trees which have been sitting for days, if not weeks, in tree lots, the Association also recommends cutting a half inch off the end of your tree's stump just before placing it in water. The freshly cut stump will allow the tree's pores to accept more water.
Keep It Watered
The simplest way to keep your tree fresh for as long as possible is to make sure that it always has water. Use a large-capacity tree stand that will hold at least a gallon of water. Check the water level every day, as Christmas trees tend to drink lots of water, especially during the first week you have it. The average Christmas tree, adds the National Christmas Tree Association, "can use up to one quart of water per day for each inch of stem diameter."
Don’t Trim the Sides of the Trunk
Some folks have Christmas tree stands with slots for the tree's stump which are just too small for the tree they have purchased. The tendency, in these cases, is to trim back the sides of the stump to make the tree fit into the stand. The National Christmas Tree Association cautions against this, encouraging the matching of tree trunk diameter to the tree stand. The stand should neither be too large nor too small. Cutting back or trimming the sides of the stump decreases the tree's ability to absorb water.
Take Extra Measures
If you've made sure to trim the bottom of the tree's stump and kept your tree freshly watered in the appropriately sized stand, but your tree is still not absorbing water, try adding hot water next time you water it. The National Christmas Tree Association advises that hot tap water will sometimes encourage a sluggish tree to absorb more water. The Association also encourages you to be patient if your tree doesn't seem to soak up water right away. Ironically, the freshest trees (especially those cut by the tree owner) often don't absorb water right away, as they have not had time to start drying out. Judge your tree's freshness by its needle retention rather than by the level of water in the stand.