A cattleya orchid clone (Cattleya labiata. Lindl.) grown in vitro at 7 concentrations of iron chelate prepared according to the method Steiner and van Winden at 0, 0.5, 1, 5, 10, 20, 40 ppm showed the most growth at 0 to 10 ppm and reduced growth at 20 and 40 ppm. Iron concentration of the tissue was 486 ppm at the beginning of the study and varied from 33 to 2880 ppm on dry weight basis at the end of 17 weeks. The number of propagules at the end of the study varied with tissue fresh weight.