Dilke assisted his father in his literary work, and was for some years chairman of the council of the Society of Arts, besides taking a prominent part in the affairs of the Royal Horticultural Society and other bodies. In 1841 he co-founded "The Gardeners' Chronicle" alongside Joseph Paxton, John Lindley and William Bradbury. He was one of the most zealous promoters of the Great Exhibition of 1851 (of which Paxton was again an integral part), and a member of the executive committee. At the close of the exhibition he was honoured by foreign sovereigns, and the queen offered him knighthood, which, however, he did not accept. He also declined a large remuneration offered by the royal commission. In 1853 Dilke was one of the English commissioners at the New York Industrial Exhibition, and prepared a report on it. He again declined to receive any money reward for his services.