The effect of biostimulators on root development of Thuja occidentalis ‘Smaragd’ and Chamaecyparis lawsoniana ‘Ellwoodii’ shoot cuttings

Kovács, Etelka and Ördögh, Máté (2026) The effect of biostimulators on root development of Thuja occidentalis ‘Smaragd’ and Chamaecyparis lawsoniana ‘Ellwoodii’ shoot cuttings. GRADUS, 13 (1). ISSN 2064-8014

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Abstract

The effect of a foliar treatment with an Ascophyllum nodosum–based biostimulant (Yeald Plus) was investigated on stem cuttings of two evergreen varieties. In Thuja occidentalis ‘Smaragd’ 0.15–0.30% biostimulant concentrations resulted in 64–66% rooting within six weeks, while the control group reached 36% only at a later stage. The root mass of rooted cuttings was higher at the 0.15% dose than at the double concentration. Chamaecyparis lawsoniana ‘Ellwoodii’ did not form roots within six weeks; however, differences in shoot biomass and water content were detected among treatments. Based on our results, foliar spraying with a 0.15% Yeald Plus solution can be an effective method in ‘Smaragd’ arborvitae propagation, whereas ‘Ellwoodii’ may require a longer rooting period and possibly an additional auxin treatment.

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