The Lake District Reforestation Project team celebrated 200 years of tree planting.
Over the past two years, the RSPB has planted 3,000 hectares (12 square kilometers) of Celebration Wood, containing dozens of native trees.
Newly planted trees include species such as sessile oak, alder, willow and aspen, as well as a new cherry tree.
The RSPB's Bea Normington said the project represented a "great opportunity" to support the "regeneration" of the landscape.
Currently, the spring flowering of cherry trees is expected to provide early nectar and pollination for bees, and the cherries are later consumed by birds and mammals.
“Every tree has its own story.”
Celebration Wood was one of the conservation projects managed by the RSPB since 2011 and owned by United Utilities, in Wild Housewater near Bampton.
Mrs Normington said: “When we launched the scheme two years ago we weren't sure how the public would react but it has been amazing.
“Each tree on the Holiday Tree has its own story, planted to honor a special event, anniversary, birthday, wedding or the life of a loved one.
He said much of the forests in the Lake District, particularly in mountainous areas, had disappeared due to grazing.
Ms Normington added: “Wood Honor is a place where people who love this beautiful part of Cumbia can support the restoration of this landscape, grow Haweswater's beautiful woodlands, improve the quality of drinking water in Haweswater Reservoir and provide a place to live. Popular animals such as red squirrels and woodpeckers are in circulation.
200,000 trees
Wild Haweswater is the largest nursery of native plants and trees in the Lake District.
There are around 30,000 plants growing here, including around 50 different native species, and around 200,000 native trees have been planted at Housewater since 2011.
Andrew Wright from United Utilities Forestry said: "We have worked with the RSPB to plant thousands of trees and restore bogs and peatlands in other important mountain areas such as Swindell Beck."
He said the move reduced the risk of flooding by "reducing the flow of water from the mountains" and helped reduce the problem of natural filtration of drinking water.
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