Jeanne, I don't believe you will have any problem planting the Allium bulbs, for me so long as the ground is not frozen I will plant my bulbs. Even after a few freezes the ground is not frozen so you should be good to go. Mulching will not hurt them. I usually plant at 3x the height of the bulb. The great thing about bulbs is they are pretty fool proof.
Curious what bulbs that you planted that did not come up?
