How deep do I plant erythroniums

Hi, J, and welcome to GoY.
Erytronium dens-canis is a woodland plant and likes partial shade in a humus rich soil, as you suggest. Plant them a couple of inches deep in the garden. They don't really like containers. Mice like all bulbs but, hopefully, they shouldn't be too much of a problem for you.

Hi Jsebmj and welcome to GoY B has given you good advice, well he would he;s married to me lol. If mice are a problem for you try planting in pond baskets - the baskets used for plants you grow in ponds.

Hi there. Plant Erythroniums between two to three times their own depth. If in doubt as to which way up, plant them sideways, they are quite happy like this. You are correct in thinking humus rich soil even though their nearest relative is the genus Tulipa that like the opposite.

planting as described above. i find squirrels like them:o(

I would also suggest soaking the corms overnight in warm water before planting. I bought two lots last year, the dried ones never grew, but the soaked ones did.

Oh dear Owdboggy, we have never had a problem with...