This work was carried out at Gharbia Governorate during the summer seasons of 1996 & 1997 to study the effect of planting system and vertical training on vegetative growth, flowering and fruit yield of cucumber plants cv. Amera II hybrid grown in the open field. Treatments included staked (vertically trained) or regular ground creeping planting, single or double rows planting and 15, 20 or 30 cm within row plant spacing. Plant population of these treatments ranged from 18, 648 to
55, 986 plants/fed.                 The results indicated that vertically trained planting increased stem length and leaf area of the fifth leaf from the growing tip as well as its fresh and dry weight compared to the regular creeping planting. Vertically trained plants had higher content of nitrogen  and potassium compared to ground creeping plants, while no significant differences in phosphorus were found among all treatments.                 Decreasing plant population and also vertical training system increased the number of pistillate flowers and decreased the staminate ones. Concerning fruit yield, both treatments of vertical training with 34, 986 plants/fed. and that of creeping planting with 55, 986 plants/fed. had nearly equal values where they had the highest early and total yield per fed., with less weight of non marketable fruits in the former treatment and higher weight in the later one. The highest fruit yield per plant was produced from the vertical planting with the  lowest plant population, while the lowest one was produced from the creeping planting with the highest plant population.