before 1845 I should think; his Op.19 was already published by 1841 (it is mentioned in a list in the Gazette musicale de Paris). Still, not unknown for things to be in the other order.
Still: Publication noted in the Journal de l'imprimerie et de la librairie en Belgique, 20 Octobre 1856, 3e année, no 11, p.203, r.820. (for bassoon and piano, 1856- maybe was published earlier in its original, English horn version. Or perhaps that was a reissue/edition w new plates...)