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National Council for the Concervation of Plants and Gardens
Through voluntary membership the N.C.C.P.G. seeks to conserve, ducument, promote and make available Britain's great biodiversity of garden plants for the benefit of horticulture, education and science.

The N.C.C.P.G. is the registration authority for approving National Collections. Each one must be as fully representative as is feasible of the specific genus or section held and must comply with stringent conditions, including good horticultural practice, record keeping and evidence of ongoing research and development. Details of the Collections are recorded in the Directory which is published annually by the N.C.C.P.G.

The National Collection in Sheffield is maintained by the Friends of the Botanical Gardens (F.O.B.S.) for Sheffield City Council. The collection is expanding as additional plants are obtained. For each of Sheffield's National Collections, the target is to have all the species and a good representation of cultivars.

The plants are propogated vegetatively from cuttings taken in summer. The species can be grown from seed and most will flower within four years. Most of the plants have been purchased from commercial nurseries in the United Kingdom but some material has been obtained by exchange from other Botanical Gardens in N.W. Europe.