African marigold (Tagetes erecta L.) plants were planted 12x25, 25x30, 30x60 and 40x90 cm apart during 1991/1992 and 1992/1993 under the condition of Lahg Governorate, Yemen in order to study the effect of planting density on growth and flower characteristics of the plants. Results showed that increasing the planting spaces between plants over 12v25 cm resulted in significant increase in plant height, weight and flower production and quality. No significant increase in plant weight or flower production and quality were achieved when spaces between plants exceeded 30x60 cm.