G. Lykokanellos¹, D. Zoumadakis¹, N. Semkova², V. Ivanova² 1 Department of Agriculture, Laboratory of Floriculture – Landscape Architecture, University of Patras, 30200 Messolonghi, Greece 2 Department of Horticulture, Faculty of Horticulture, Agricultural University, 4000 Plovd