The present invention relates to a hybrid Swiss chard seed designated 69-600 RZ. The present invention also relates to a Swiss chard plant produced by growing the 69-600 RZ seed, which plant exhibits a combination of traits including having green leaves with white petioles and leaf midribs, resistance to downy mildew (Peronospora farinosa f. sp. betae), field resistance to Cercospora leaf spot, strong blistering of the leaf blade and a dark to very dark green leaf coloring. The invention further relates to methods for producing the Swiss chard cultivar, represented by hybrid Swiss chard variety 69-600 RZ.
