An arboretum is a tree collection - a specialized assemblage of different trees. Here I share with you the arboretums I have visited. And is it arboretums or arboreta? Both, according to the dictionaries at Oxford University Press and Cambridge University Press :)
You'll also find trees as well as many other plants in my section about botanical gardens.
Westonbirt - the National Arboretum
Lots of big, mature trees here, as well as some interesting younger specimens.
Check out
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Plenty to see walking around the wilder side of Westonbirt in Silk Wood: wonderful leaves, trunks, flowers and fruit!