4 . Temperature
Ensure that the seeds are warm enough. Bell pepper seeds do need a warm period in order to germinate. Ambient air temperatures of over 80° Fahrenheit (26.6° Celsius) and slightly warmer soil temperatures are recommended for good results. Seeds that are slow to sprout may benefit from the use of heating mats. Gardeners should note that the plants will not sprout at all if temperatures are below 55° Fahrenheit (12.7° C).