Abstract
Herbal parts and seeds of Origanum vulgare subsp. hirtum samples from populations growing in the Marmara region of Turkey have been collected. They were raised at the demonstration garden of Atatürk Central Horticultural Research Institute. Both wild crafted and raised plants herb yield, essential oil yield and composition were determined in order to find superior populations. Superior population of 61 populations planted to irrigated environment of culture and their performance had been observed according to harvest time (before inflorescence, beginning inflorescence, whole inflorescence), characteristics of yield and quality. The experiment was designed as randomized block with four replications. According characters which had been measured different harvest time had been important on yield and quality of Istanbul Oregano.