If you want to make your Christmas tree last a long time, you'll need to take care of three things: water, food and humidity.
AccuWeather suggests you get your tree in water as soon as possible. But make sure the water isn't too cold, otherwise that could shock your tree.
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You can buy specific food for your tree as well. But the bottom line is, all your tree needs is a couple of tablespoons of sugar to keep it well fed.
AccuWeather also suggests running a humidifier to give some extra humidity to your tree.