Effect of Plant Density and Planting Pattern on Yield and Yield Components of Iranian Ox-Tongue (Echium amoenum Fisch. & Mey.) in Guilan Province

To study the effect of plant density and planting pattern on Iranian ox-tongue, an experiment carried out with two factors: planting pattern (square and rectangular pattern) and plant density (2, 4, 6, 8 plant m-2) in a factorial test performed based on RCBD in 3 replications during 2009-2010 in Latmahalleh Eshkevarat village in Guilan province, Iran. Characteristics that measured included: dry flowers yield, plant dry-weight, number of inflorescence per plant, number of flower per inflorescence, plant height and flower length. The results indicated that effect of plant density on dry flowers yield, plant dry weight, number of inflorescence per plant, number of flower per inflorescence and flower length (P