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Pyracantha seeds usually require cold stratification before germination. Protocols vary, but twelve weeks of moist stratification in a refrigerator or outdoors in a cold climate would likely be effective. As Pyracantha seeds develop within fleshy pome fruit eaten by birds, light abrasion to simulate passage through a bird's gut might also be helpful. If you have enough seed try severla differnt likely protocols to discover which would be most effective under your conditions. Is there a particular Pyracantha sp. that you are interested in propagating?
Firethorn (Pyracantha), in the Rose Family (Rosaceae), is a genus of evergreen or deciduous shrubs and small trees native to Europe and Asia.