Tree collection refers to the practice of gathering various species of trees for study, conservation, or landscaping purposes. This can include collecting seeds, leaves, or even entire saplings. Tree collections are often maintained by botanical gardens, arboretums, and research institutions to preserve biodiversity and educate the public about different tree species. In addition to conservation efforts, tree collections can also play a vital role in urban planning and environmental restoration. By selecting appropriate species, cities can enhance green spaces, improve air quality, and provide habitats for wildlife. Organizations like the Arbor Day Foundation promote tree planting and care, further supporting these initiatives.