The experiment on “The effect of different corm sizes on the growth and flower production of gladiolus”, was carried out at Ornamental Plant Nursery, Department of Horticulture, The University of Agriculture Peshawar. Three corm sizes i.e., large corm size, Medium corm size and Small corm size were used in the experiment. The experiment was laid out in Randomized Complete Block Design (RCBD) with three replications. The data were recorded on days to plant emergence, plant height (ft.), number of leaves plant^-1, number of florets spike^-1, emergence of spike and size of spike (ft.). The results showed that different corms sizes significantly affected all of the growth parameters. Data regarding various corms size showed that maximum days to spike emergence (11.3)  were recorded in small corm size, which are statistically similar to emergence of spike (91) and no of leaves,(12.0) while maximum no of florets spike^-1_, (13) ,plant height (3.1ft),size of spike(1.7ft) were found in plants planted by large corm size. It is concluded that corm of larger size (>1.0cm) enhanced most of the studied parameters in gladiolus as compared to medium and smaller corms.

KEYWORDS: Corms Size, Flower, Gladiolus, Growth, Production.