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In an early study we reported the feasibility of propagating erect blackberries by floricane cuttings obtained during winter pruning. But how soon during the dormant season can the stem cuttings be collected? And, is a mist system really needed to promote rooting? Experiments were conducted to address these questions. Stem cuttings of `Arapaho', `Choctaw', and `Shawnee' blackberries were collected on two dates, 15 Nov. and 15 Dec. 1996, stuck in peat-perlite mix, and placed in two rooting environments, with and without intermittent mist. Data was recorded on 15 Jan. 1997. Percentage of cuttings rooted was affected by the cultivar-by-date and cultivar-by-environment interactions. Values of 98%, 88%, and 75% were observed for cuttings taken on 15 Dec. of `Choctaw', `Arapaho', and `Shawnee', respectively, while only 19%, 17%, and 45%, respectively, for cuttings of 15 Nov. Intermittent mist promoted higher rooting (85% vs. 31% without mist) and lower death of cuttings (4% vs. 45% without mist) only of `Shawnee'. Greater number of cuttings died when taken on 15 Nov. (21%) than on 15 Dec.(6%). These findings suggest that accumulation of chilling units is an important factor to take into consideration when propagating blackberries by floricane cuttings.

Date of Collection and Rooting Environment Affect Propagation of Erect Blackberries by Floricane Cuttings