Abstract: The seeds of wild pistachio (Pistacia vera L) due to the seed dormancy, have a low and non-uniform germination percentage, which hinders the subsequent growth of seedlings. Therefore, it is important to know the cause of dormancy, and to find the suitable mechanism to eliminate it. For this purpose, in 2009, an experiment was conducted in a completely randomized design with 3 treatments (seeds without shell, seeds with broken shell, and seeds with shell and 5 replications. The results showed that seed shell removal to compared to other treatments had a significant effect on all measured traits (Germination Percentage, Rate of Seed Germination, Mean Germination Time, Mean Daily Germination, and Germination Energy) The obtained data indicate that complete removal of the seed shell as a physical barrier is an effective way to facilitate the seed germination and regeneration of this species.

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