TUALATIN, Ore. — Rosa Villarreal’s three young sons jumped and ran around the field of Christmas trees like jackrabbits, their excitement palpable as they raced from evergreen to evergreen. The boys, ages 2, 4 and 6, were picking out a real tree this year — a new tradition their young parents hope will create lasting memories.

“I saw this video where the big tree, the mom decorates it, and the little tree, the kids get to decorate it,” she said, as her husband, Jason Jimenez, snapped a photo of their toddler posing with a tiny tree just his size.

Christmas tree farmers across the U.S. worry families like Villarreal’s are slowly dwindling. Artificial trees, once crude imitations of an evergreen, are now so realistic that it’s hard to tell they are fakes even though many are conveniently pre-strung with lights and can fold up for storage at the push of a button.

Between 75 and 80 percent of Americans who have a Christmas tree now have an artificial one, and the $1 billion market for fake trees is growing at about 4 percent a year — even though they can be reused again and again.

To combat this trend, Christmas tree farmers have joined forces as the Christmas Tree Promotion Board and are running a social media ad campaign this holiday season to tout the benefits of a real evergreen. The campaign, called “It’s Christmas. Keep It Real!,” is funded by a 15-cent fee that tree farmers pay for each tree they harvest.

It’s a modern-day attempt at such famous agricultural ad campaigns as “Got Milk?” and “Beef. It’s What’s For Dinner.”