Table 3.

Effects of pre-harvesting conditions of Origanum syriacum.

Conditions	Main Effects	References
Irrigation level	Height and branching rate significantly increase with increasing of irrigation frequency.	[16]
	Thymol and carvacrol content of essential oil are not significantly affected.	[16]
Geographical location and cultivation method	Both essential oil yield and thymol and carvacrol levels are affected.	[19,20,21,22,23]
Harvesting period	The highest essential oil yield is obtained from summer harvesting.	[20,21,23,24]
	Thymol and carvacrol levels are higher in summer during the flowering period	[21,23]
	Wild O. syriacum leaves exhibit a higher level of thymol and carvacrol in June after flowering.	[25]
pH of soil	Significant positive correlation between essential oil yield and soil pH as well as soil phosphorus content.	[23]