especially during an UP winter!
This is one of the tips I submitted early on... Trish or Dave must have dug it up LOL.
I put some bulbs (daffs especially) into holes more like 2 to 3 times their diameter. In our clay soil, they just seem to do better planted a little more shallowly. My young garden helper does better with the idea that the bulbs need to end up deep enough that you could stack 2 bulbs on top of each other in the hole... or, however big the bulb is, that's how much soil needs to be on top of it once the hole is filled in. When the soil is most & soft, we just push "little bulbs" down in with a finger.
BTW, I've learned that lilies have contractile roots (how cool is that??) and will pull themselves down to their preferred depth. So if you're planting lilies this spring, you don't have to knock yourself out making 8 inch deep holes...