>>1045871Soil temps need to be between 10-20 C (50-70 F) for strawberries to successfully germinate, so a heat mat will help if it's cold where you are.
How are you growing them? Seedling flats, pots, or in ground?
Also, there's another method you can try: Buy one plant and layer all the runners like pic related, then once they take good roots you can transplant the babby plants and you'll have loads of berries.