You planted very deep.
1/4" below surface is more like it.
The seeds may have rotted by now.

Just to clear up, germination refers to getting the seed to 'pop' and grow its tap root... this can be done in water, towelling, soil, but it's still germination.

Temperature plays a role in length of time to germ and break dirt. Too low, nothing happens, too high, you get rot, try to keep it right at 75-80 degrees F until you get true leaves.