What are the most common types of tree species grown for Christmas trees?

* Douglas fir (_Pseudotsuga menziesii_) is the most popular Christmas tree species in the United States. It has a symmetrical shape, soft needles, and a pleasant fragrance.

* Balsam fir (_Abies balsamea_) is another popular Christmas tree species. It has a more compact shape than Douglas fir, and its needles are shorter and stiffer. Balsam fir has a strong, sweet fragrance.

* Scotch pine (_Pinus sylvestris_) is a fast-growing Christmas tree species that is well-suited to cold climates. It has a pyramidal shape and long, bluish-green needles. Scotch pine has a mild fragrance.

* White pine (_Pinus strobus_) is a native North American Christmas tree species that is known for its long, soft needles and mild fragrance. White pine is a slow-growing tree, but it can live for up to 200 years.

* Eastern red cedar (_Juniperus virginiana_) is a popular Christmas tree species in the southern United States. It has a dense, pyramidal shape and short, sharp needles. Eastern red cedar has a strong, pungent fragrance.

Broadleaf Evergreens

* Leyland cypress (_x Cupressocyparis leylandii_) is a fast-growing evergreen tree that is often used for Christmas trees. It has a pyramidal shape and soft, feathery needles. Leyland cypress has a mild fragrance.

* Arizona cypress (_Cupressus arizonica_) is a native North American evergreen tree that is well-suited to warm climates. It has a pyramidal shape and short, scale-like needles. Arizona cypress has a strong, pungent fragrance.

* Carolina cherry laurel (_Prunus caroliniana_) is a broadleaf evergreen tree that is native to the southeastern United States. It has a dense, rounded shape and glossy, dark green leaves. Carolina cherry laurel has a mild, sweet fragrance.

* Japanese holly (_Ilex crenata_) is a popular Christmas tree species in Asia. It has a dense, pyramidal shape and small, glossy, dark green leaves. Japanese holly has a mild, sweet fragrance.

* English holly (_Ilex aquifolium_) is a native European evergreen tree that is often used for Christmas trees. It has a dense, pyramidal shape and spiny, dark green leaves. English holly has a strong, bitter fragrance.