Seedlings of silkoroi (Albizia procera), chapalish (Artocarpus chaplasha), gam ar (Gmelina arborea), champa (Michelia champaca), and teak (Tectona grandis) were raised in 3 different sizes of polybags to study their growth performances at the nursery as well as in the field for the selection of an optimum size of polybag for large scale propagation. The results showed that the height and diameter growth of these species increased with the increase of polybag size, and maintained a good correlation with the seasonal variations (semi-dry, dry and wet season). In the field, seedlings raised in small and medium sizes of polybags (15 x 10 cm and 23 x 15 cm) showed higher percentage of survivality as their root/shoot ratio was higher. The small size (15 x 10 cm) polybags arc, however, recommended for the propagation of silkoroi, champa and gamar and the medium size (23 x 15 cm) polybags for teak and chapalish.