studied the importance of seed quality for ger-mination and seedling survival of guayule. The seeds of the guayuleYULEX-B line used in this study were harvested in May 2010. Seedswere air dried and packed in seed cotton drawstring bags. Thesebags were then placed in buckets and stored in a climate controlledseed room at 25–30◦C and 10–30% relative humidity. Only filledseeds of YULEX-B line were used