Did you germinate them til,the tap root was at least a quarter to half inch long? Did you use good potting soil mix that is for seed starting or mixed with perlite to keep it fluffy and not compact? Did you make the hole only like quarter to half inch deep and lightly push dirt back over top? Keeping light right over the containers or trays?Give 1 good watering til they come up?All of these things would help to see what the issue is.My come up in 2 days.The ones I did last week are 3 inches tall and filling in at 3 days in soil.