Abstract
Plants of Berberis thunbergii DC., B. thunbergii DC, ‘Atropurpurea’, Ligustrum obtusifolium Seibold and Zucc. var. regelianum (Koehne) Rehd., and L. × vicaryi Beckett were grown at 37, 53, 70 and 100% full sunlight to determine rootability of cuttings. Rooting hormone levels of 0, 0.1, 0.3 and 0.8% IBA in talc were applied to the cuttings, and % rooting, root length, and fresh and dry weights were recorded. Optimum rooting of cuttings of Berberis resulted when stock plants were grown at 70% light, with 37% light being the next most successful. Optimum rooting of cuttings of Ligustrum obtusifolium var. regelianum resulted when stock plants were grown at 37% light. Rooting of Ligustrum × vicaryi did not respond to light intensity. An interaction between rooting-hormone and light intensity was noted for root length of Ligustrum species.
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