While the first Christmas tree farm may have appeared as early as 1901, Christmas tree production in the United States was largely limited to what could be harvested from natural forests until the 1950s.
 Among the important Christmas tree producing areas in the U.S. are Wisconsin, North Carolina, Pennsylvania and the Pacific Northwest.
 In 2002 Christmas tree production in the United States totaled 20.8 million trees and the U.S. was one of the world's leading producers of natural Christmas trees.
 That same year, Pennsylvania was the top producer in the United States.
The White House Christmas Tree, also known as the Blue Room Christmas Tree, is the official indoor Christmas tree at the residence of the President of the United States, the White House.
 The first indoor Christmas tree was installed in the White House sometime in the 19th century (there are varying claims as to the exact year) and since 1961 the tree has had a themed motif at the discretion of the First Lady of the United States.
Happiness Is a Warm Blanket, Charlie Brown is a "Peanuts" television special that was released in 2011.
 The special is the 45th "Peanuts" special and the first produced without Bill Melendez on the production team.
 It is also the first special without the direct involvement of "Peanuts" creator Charles M. Schulz, Lee Mendelson Productions or Bill Melendez Productions (it is unknown, though, if Lee Mendelson also worked on this special).
 In addition, it is the first "Peanuts" special produced in part under Warner Bros.
 Television, which holds the home media distribution rights to the Peanuts specials.
An artificial Christmas trees is an artificial pine and fir tree manufactured for the specific purpose of use as a Christmas tree.
 The earliest artificial Christmas trees were wooden, tree-shaped pyramids or feather trees, both developed by Germans.
 Most modern trees are made of polyvinyl chloride (PVC) but many other types of trees have been and are available, including aluminum Christmas trees and fiber-optic illuminated Christmas trees.
A Charlie Brown Christmas is a 1965 animated television special based on the comic strip "Peanuts", by Charles M. Schulz.
 Produced by Lee Mendelson and directed by Bill Melendez, the program made its debut on CBS on December 9, 1965.
 In the special, lead character Charlie Brown finds himself depressed despite the onset of the cheerful holiday season.
 Lucy suggests he direct a neighborhood Christmas play, but his best efforts are ignored and mocked by his peers.
 After Linus tells Charlie Brown about the true meaning of Christmas, Charlie Brown cheers up, and the Peanuts gang unites to celebrate the Christmas season.
Melendez Films is a film animation studio.
 It was founded in 1969 as a London subsidiary of Bill Melendez Productions (best known for producing the Peanuts specials) by Steven C. Melendez (son of animator Bill Melendez).
A Christmas tree stand is an object designed to support a cut, natural or an artificial Christmas tree.
 Christmas tree stands appeared as early as 1876 and have had various designs over the years.
 Those stands designed for natural trees have a water-well, which, in many cases may not hold enough water to adequately supply the cut tree.
 Some specialty Christmas tree stands have value on the secondary antiques market.
A Singing Christmas Tree, sometimes called a Living Christmas Tree, is an artificial Christmas tree filled with singers used as part of nativity plays. First appearing in 1933 at Belhaven University, they later made their debut indoors at West High School in Denver, Colorado, and then in 1957 in Sacramento, California.
 Constructed of steel, the tree is actually a conical circular sector where between one-third and one-half of an actual Christmas tree is shown.
 Depending upon tree size, they can accompany between 30 and 450 singers.
 These trees can be put up by churches or communities depending upon the location.
 Since then, the singing Christmas tree concept has spread to Canada, the Philippines, South Korea, Switzerland and Sri Lanka.
 The most attended tree takes place in Knoxville, Tennessee, with 60,000 attendees in 2007.
The Mount Ingino Christmas Tree is a lighting illumination in the shape of a Christmas tree that is installed annually on the slopes of Mount Ingino (Monte Ingino in Italian) outside the city of Gubbio, in Umbria region in Italy.
 The tree is also called the Gubbio Christmas Tree or "the biggest Christmas tree in the world".
 In 1991 the Guinness Book of Records named it "The World's Largest Christmas Tree".
An aluminum Christmas tree is a type of artificial Christmas tree that was popular in the United States from 1958 until about the mid-1960s.
 As its name suggests, the tree is made of aluminum, featuring foil needles and illumination from below via a rotating color wheel.
 The aluminum Christmas tree was used as symbol of the commercialization of Christmas in the highly acclaimed and successful 1965 television special, "A Charlie Brown Christmas", which discredited its suitability as holiday decoration.
 By the mid-2000s aluminum trees found a secondary market online, often selling for high premiums.
 The trees have also appeared in museum collections.

Question: Which Christmas special, directed by Bill Melendez, featured an aluminum Christmas tree?
Answer: A Charlie Brown Christmas