Abstract
Softwood and semi-hardwood cuttings of 4 Tilia taxa were taken at different times and treated with high concentrations of IBA. Rooting-response varied with taxa and sampling-date. Rooting in Tilia americana L. cuttings was maximum when taken on 19 May and 1 June. Cuttings of Tilia cordata Mill. did not differ significantly in rootability when taken on 19 May, 22 June or 13 July, but rooting was significantly less with 3 August cuttings. Tilia × euchlora Koch cuttings did not root. All Tilla × euchlora Koch ‘Redmond’ cuttings taken on 19 May or 22 June rooted. A 5-second basal dip of IBA significantly stimulated rooting, especially in the range of 20 000–35 000 mg 1 −1.
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