Some 255 British and 650 Argentine troops died after the UK sent a task force to the islands after Argentina’s invasion on 2 April 1982.
The anniversary comes amid renewed tension, as Argentina has reasserted its claim to the islands. A single candle will be lit as a gesture to mark the anniversary.
The National Memorial Arboretum was conceived as a living tribute to the war-time generations of the 20th century and planting began in 1997.
The site includes over 50,000 trees including an avenue of young chestnuts, golden stemmed ash and giant redwoods forming a living tribute.