Effects of Fe and Trichoderma harzianum Bi strain on plant growth and development were investigated. Experiments were carried out in an glasshouse and in pots filled with soil, perlite and coco peat (1:1:1) were used as the growing medium. Plant roots (seedlings with three leaves) were inoculated with Trichoderma harzianum at (0 and 8% w/w) as media mixture. Fe spray at (0, 0.75, 1.5, 3 g/lit), was applied 3 times on a month interval after T. harzianum inoculation. Factorial experiment was conducted in a completely randomized design with 3 replications. After six months, the plants were sampled for growth comparisons. Based on results Trichoderma harzianum improved morphological characteristics (P≤0.01). There were differences between the untreated control and the treatments for all of the growth parameters with the exception of spathe area and number of flowers. Fe spray and intraction between Trichoderma harzianum and Fe significantly increased all morphological growth parameters with the exception of spathe area, leaf area and number of flowers. By applying Terichoderma sucker number (400%), leaf number (586%), sucker fresh weight (386 %) and sucker dry weight (583%) significantly increased compared with control variant in a same concentration of Fe. The data obtained from the experiment showed the potential of Trichoderma harzianum and Fe spray to enhance growth and development of Spathiphyllum sp in greenhouse conditions.

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