A suppressive effect was obtained by the henna plant (Lawsonia inermis) against M. incognita development. Henna reduced tomato root gall numbers, number of the egg-laying females and rate of the nematode reproduction, when tomato and henna were grown together. Also, same reduction in these nematode biological processes was found, when tomato plants were grown in soil containing root exudates of henna, but with less amount. When henna was grown alone, root gall index and the rate of nematode reproduction reduced to 75 and 99%, respectively, compared with those of tomato grown alone.