The United States has a Christmas tree shortage. Many tree lots and farms have already sold out of their largest trees, and some are closing early because of a lack of inventory.

The pandemic is one contributing factor. “I’ve had customers tell me they wanted something happy in the house,” an employee at Boyd’s Christmas Trees in North Carolina told The Asheville Citizen Times. “They want something pretty to look at, and some that usually do artificial, this year they wanted a live tree.”

But there are other causes, too. Christmas trees can take up to 12 years to grow from seedlings to a harvestable size, which means that 2008 was a key planting year for this year’s trees. In 2008, the economy was in a recession, forcing some farms to close and others to plant fewer trees.

Climate change also plays a role. Wildfires on the West Coast have damaged some tree farms, The Wall Street Journal reported. And insect infestation and droughts “have affected the trees up and down the East Coast,” Russell Trent, the owner of Mark’s Christmas Tree Farms in Connecticut, told NBC.

If you want a tree and don’t have one yet, you can probably still find one. Just be prepared for a smaller selection and higher prices.