Oregano Lippia graveolens HBK is a species native from arid areas of Mexico with great economic potential because it has worldwide demand for its applications in pharmaceutical and cosmetic industries. Oregano can propagated by seed, however, has very low germination percentage, for that reason this study was developed in order to evaluate 12 different seed treatments to improve emergence and growth of seedlings for transplanting. The treatments consisted of immersion of seeds in gibberellic acid 100 ppm with a time of 24h (T1), 200 ppm gibberellic acid 200 ppm, 12h (T2), gibberellic acid 200 ppm ,24h (T3), gibberellic acid 250 ppm 12h (T4), water hot (50 °) 12 h (T5), hot water (50 °) 24h (T6), hot water (40 °) 12 h (T7), hot water (40 °) 24h (T8), water at ambient temperature 24h ( T9), water at ambient temperature 48 h (T10), water at ambient temperature 5 days (T11) and seeds non treated control (T12). A randomized block design with four replications was used; each treatment involved a group of 100 seeds, which were planted in expanded polyurethane trays with peat moss. The seedlings were irrigated with a sprinkler system type nebulizer once or twice a day. From the fifth until 35 days after sowing (das) plants emerged were counted. At 110 das, plant height, leaf area, dry weight of shoot and root were registered. The results indicated that treatment with gibberellic acid at a concentration of 250 ppm and a time of 12 h showed the highest emergence and growth of plants.

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