One at least of James Liddell's sons - my ggggf William Liddell (1802-54) continued the interest in plants and seeds; shortly after he emigrated to Madras (1833) he became Secretary (1835-38) of the newly founded Agricultural and Horticultural Society of Madras. References I've found online include correspondence ordering vegetable seeds and fruit or flower trees. He also corresponded with a parliamentary committee in London about the possibility of growing tea in the area (I don't think that came to anything).
