The relationship between the total flavans (biflavan, catechin, epicatechin and oligomer flavans) and the graft-take in walnut was studied. Total flavans were determined by thin layer chromatography in the phloem tissues of annual shoots. Content of total flavans and percentage graft-take were recorded from November 1997 to October 1998. Following chip-budding, grafted plants were exposed to controlled conditions for one month. The total flavan contents ranged from 10.8 mg g(-1) in March to 14.1 mg g(-1) in May. Graft-take percentages varied from 32% in June to 100% in February. A negative correlation (r = -0.618) was found between total flavan content and graft-take.