Apart from the issue of using peat which is not P.C. these days. I would suggest that the best growing medium is a John Innes No 3 with added grit in the ratio of about 2/3 growing medium to 1/3 grit/sharp sand. When I grew them (too much winter protection needed here to be successful) I actually grew them in my favourite mix of 1/2 peat free compost/ 1/2 equally mixed grit/ sterile soil/ perlte with some feed granules.
Plant the bulbs close together with their shoulders out of the compost.

As owdboggy says can be tender. Some of mine are in a pot.......been there so long can't recall what soil. I have a good sized clump in the garden that bloomed for Britain last year. The tops are out of the soil on view. Leafing up well now. They are cuddled up together with bare shoulders.....like girls in a club queue at 11pm!!!!!! I live within M25 weatherwise

I have them then in a normal chalky soil, no peat as it is ecologically 'wrong' and peat retains too much moisture.