The red cabbage (RC) (Brassica oleracea var. capitata f. rubra) belonging to the family Brassicaceae (order - Brassicales), is an herbaceous, biennial, dicotyledonous flowering plant. Red cabbage is a rich and relatively cheap source of anthocyanin pigment. The principle constituents of RC are isothiocyanates (glucosinolate), vitamins A, B, C and anthocyanins. The objective of the present study has been to standardize such a therapeutically useful plant, to avoid its adulteration or substitution. In the present study, the pharmacognostic standardization of powdered leaves of RC was carried out to determine its macro and microscopical characters and also some of its quantitative standards. Physico-chemical evaluation includes ash values, extractive values, moisture content was evaluated. Preliminary phytochemical screening of the aqueous extract of RC powder was carried out. This was further confirmed by carrying out thin layer chromatographic (TLC) studies. These findings will be useful towards establishing pharmacognostic standards on identification, purity, quality and classification of the herb, which is gaining relevance in plant drug research.