October 2014 issue of the Cornell Flower Bulb Research Program Research Newsletter:
We learned something new (for us at least) about Muscari (grape hyacinths) this past year. That is, they really do not need to be “buried” when planting. Simply pressing them about ½ way into the planting mix is deep enough, and they do not need foam rubber (as used for hyacinths and daffodils).
Read the whole article. Starts on page 6.