Lawrence's chief interest, however, was horticulture, an interest he had inherited from his mother, herself a horticulturalist of note. From 1885 to 1913 he was President of the
Royal Horticultural Society which increased greatly in numbers and means during this term. He was determined that it should be restored "to horticulture pure and simple", rather than entertaining the public. He was chiefly responsible for moving the Society from its expensive
Kensington site to a more practical home in
Westminster in 1904. The Society presented him with the
Victoria Medal in 1900, a portrait painted by
Sir Hubert Herkomer in 1906, and the
Veitch Gold Memorial Medal 1913. The Society founded the Lawrence Gold Medal in his honour. He was one of the world's leading
orchid collectors. He employed several botanical artists to record his orchid collections including
John Nugent Fitch, John Livingston Macfarlane and
Nellie Roberts. He asked his wife to give plants of botanical interest to
Kew after his death: 580 were thought to qualify. He presided at the Royal Horticultural Society conference on
hybridisation in 1899, which is now officially regarded as the first international conference on
genetics. In 1905,
Professor M. Foster named a hybrid
Aril Iris after him, a cross between
Iris iberica X
Iris pallida. Also
Clematis texensis 'Sir Trevor Lawrence',
Tulipa 'Sir Trevor Lawrence' and
Begonia were also named after him. A genus of orchids,
Trevoria, bears his name as well. ==Hospital body contributions==