Nymans, Handcross, Haywards Heath, West Sussex, is an English garden developed by three generations of the Messel family, from the late 19th century, and brought to renown by Col. Leonard C.R. Messel. Nymans, since 1953 a National Trust property, is the origin of many sports, selections and hybrids, both planned and serendipitous, some of which can be identified by the term nymanensis, "of Nymans". Eucryphia × nymansensis (E. cordifolia × E. glutinosa) is also known as E. "Nymansay". Magnolia × loebneri 'Leonard Messel', Camellia 'Maud Messel' and Forsythia suspensa 'Nymans', with its bronze young stems, are all familiar shrub to gardeners.

In the late 19th century, Ludwig Messel, a member of an unusually creative German family settled in England family, bought the Nymans estate, a house set in 600 acres on a sloping site overlooking the picturesque High Weald of Sussex, to make a setting for family life and entertainments, with Arts and Crafts-inspired "garden room" planning where topiary features contrast with new plants from temperate zones around the world. Messel's head gardener from 1895 was James Comber, whose expertise helped form plant collections at Nymans of camellias, rhododendrons, which here, unusually at the time, were combined with plantings of heather (Erica) eucryphias and magnolias. William Robinson advised in establishing the Wild Garden.