Nepeta Binaludensis Jamzad is a rare medicinal plant of the Lamiaceae, which is used mostly to treat digestive diseases and nervous disorders. Plant growth promoting rhizobacteria ( PGPR ) are free-living soil bacteria, which enhance plant growth and development by a wide variety of mechanisms. The aim of this study is to investig ate the effects of inoculation of PGPR on some growth characteristics of Nepeta binaludensis . The strains used in the present study include Azotobacter chooroccum, Bacillus cereus and Pseudomonas putida . Bacillus cereus in combination with Pseudomonas putida was considered as one treatment. An experiment was conducted based on factorial in a completely randomized design with f our replications. Results indicated that all the selected bacteria improved plant growth characteristic s such as shoot and root lengths, shoot and root dry weights, root diameter, surface area of roots and total leaf area. Azotobacter inoculation had the most effect on the shoot length, shoot dry weight, surface area of roots and total leaf area. Taking Bacillus cereus and Pseudomonas putida at the same time significantly, (P ≤ 0.05) increased leaf area and all of the root traits. According to our results, Azotobacter and the other examined bacteria could be applied as biofertilizer for improving the productivity of Nepeta Binaludensis .

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