Agricultural Research Council - Vegetable Industrial and Medicinal Plants, Pretoria, South Africa. Laboratory of Growth Regulators, Faculty of Science, Palacký University & Institute of Experimental Botany AS CR, Olomouc, Czechia. Research Centre for Plant Growth and Development, School of Life Sciences, University of KwaZulu-Natal Pietermaritzburg, Scottsville, South Africa. Department of Horticulture, Faculty of Applied Sciences, Durban University of Technology, Durban, South Africa. School of Life Sciences, College of Agriculture, Engineering and Science, University of KwaZulu-Natal, Durban, South Africa. Indigenous Knowledge Systems Centre, Faculty of Natural and Agricultural Sciences, North-West University, Mmabatho, South Africa.