It’s not a real plant, but the Swiss Family Robinson Treehouse is pretty close to real. The Cooperative Welding and Mfg. Co. (Cowelco) built the super structure for the Swiss Family Robinson Treehouse for Disneyland in 1962. According to PlantsOfDisneyland.com, the Moreton Bay Fig Tree in 
Anaheim was a model for the Disney Imagineers while they were building the treehouse. Here’s a Google Street View of the Fig Tree.
Anaheim started in 1857 and the tree was planted in the late 1800’s by a local horticulturist. Below is guided tour from the LA Times and an advertisement for the newest attraction at Disneyland (in 1962)!
“Just in time for Thanksgiving fun!”
Disneyland branches out with the world’s tallest Tree House!
Now you can thrill to a real Swiss Family Robinson adventure tremendous giant! More than 7 stories high, 80 feet wide, it’s the biggest in the whole world. Explore the three different levels… see all of the Magic Kingdom spread beneath your feet. Climb to new heights of fun!
SPECIAL HOLIDAY HOURS
Thanksgiving Day… 10 am – 7 pm
Fri., Nov. 23rd… 9 am – 9 pm
Sat., Nov. 24th… 9am – 9 pm
Sun., Nov. 25th… 10am – 6 pm