Google Images first offering for 'tree'.
Basically, for every child born or adopted in Wales, the government sponsors the planting of two trees - one in newly created woodland in Wales (Marianna's is in Pantside Community Woodland Park, near Newbridge in Trecelyn), and the other in the garden of a family home in the Mbale region of Uganda. As the letter says: "This [fruit] tree will help protect local communities from the effects of soil erosion while also providing them with food, shelter and a source of income."
"Trees are critical to the environment, both locally and globally. Planting trees in Wales and Uganda will be vital in helping to tackle climate change while also improving our environment. With these trees we hope your child will feel a personal connection with their environment."
For more information, check out Size of Wales' Plant! page.