 Governor Brisbane was a president of the Society and in the 1820s granted an experimental garden at Parramatta for the promulgation of various species of plants and trees for scientific research.The Horticultural Society was a separate body, becoming united with its Agricultural counterpart in 1826, under the leadership of Sir John Jamison.An 1828 article in a magazine called "The Blossom" alludes to a certain amount of criticism by the horticulturally inclined of this leadership but Jamison was a "mover" and had managed to organise a committee of management for the Society's garden in Parramatta (on this site), something not previously achieved.