Established at the foundation of Gondor in II 3320,1 the line of White Trees was interrupted in III 2872, but resumed in III 3019 and continued into the Fourth Age
A title of any of various White Trees that grew in the courts of Minas Tirith, descended from Nimloth of Númenor, and ultimately (it is said) from Telperion itself.
This was the date of the establishment of the line of the White Trees, with the planting of the White Tree of Isildur, though strictly speaking none of the trees of the line would have been known as the 'White Tree of Minas Tirith' until long afterward. The White Tree of Isildur grew for about a century in Minas Ithil before that city was captured, and its seedling was planted in Minas Anor (as Minas Tirith was then known) in II 2. Minas Anor would not become Minas Tirith until after III 2002, some centuries into the lifetime of the second White Tree to grow there, which would therefore be the first to be known as the 'White Tree of Minas Tirith' during its lifetime.
2
Many earlier editions of The Lord of the Rings give an incorrect date for the death of the second White Tree; the Tale of Years in those editions wrongly shows III 2852, whereas the correct date of III 2872 is well established. This error is corrected in later editions.