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The gardens boast 3,000 plant species and include the National Collection of Campanulas.
In the United Kingdom, the National Collection of colchicums is maintained at Felbrigg Hall, Norfolk.
Exbury holds the national collection of Nyssa (Tupelo) and Oxydendrum under the NCCPG National Plant Collection scheme run by the National Council for the Conservation of Plants and Gardens.
The gardens are home to the National Collection of Colchicums.
The gardens contain the National Plant Collections of Lilac, Deutzia, Hosta and Hemerocallis.