Effect of growing conditions on proximate, mineral, amino acid, phenolic composition and antioxidant properties of wheatgrass from different wheat (Triticum aestivum L.) varieties

•Wheatgrass of four wheat varieties grown using different conditions was investigated.•Mineral, ash, protein, amino acid and phenolic contents varied with grown conditions.•C-306 grown using cocopeat with nutrient solution had abundant essential amino acids.•HD-3086 grown using soil exhibited the highest antioxidant properties.•Phenolic acids and flavonoids were predominant phenolic compounds in wheatgrass.