American holly is grows slowly. It can be planted and pruned as a hedge or grown as tree, reaching 40-50 feet. Toward the end of the first century, a physician named Galen prescribed juniper tree extract to shrink cancerous tumors. The oldest living tree is a bristlecone pine named Methuseleh growing in California. It is estimated that this particular tree is 4,700 years old.
Bristlecone pines are very slow growing.
They gain about one inch every 100 years. The most isolated tree is a Norwegian spruce growing on Campbell Island in Antarctica. Its closest tree neighbor is about 120 miles away, in the Auckland Islands. There are approximately 100 species of mistletoe native to the United States. This evergreen does not grow in soil but on the tops of tree branches.