This is a picture of the Mable Hill Park Black Walnut Tree in London, and is believed to be the oldest in the UK.
Credit: Jim Linwood from London, CC BY 2.0 via Wikimedia Commons, Creative Commons: Attribution.
This is a picture of the nuts that grow on these trees.
Credit: Horst J. Meuter, CC BY-SA 4.0 via Wikimedia Commons, Creative Commons: Attribution, Share Alike International.
These birch trees are located in their own birch forest
Credit: Matthew Kosloski, BY CC0 1.0, via Wikimedia Commons, Public Domain.
This is a row of poplar trees that are located on a farm in the UK
Credit: Mick Garratt / Row of Poplar Trees, CC BY 2.0, via Wikimedia Commons, Creative Commons: Attribution, Share Alike.