I find that it's always worthwhile finding out where the bulbs originate. If it's appropriately named like Ixiolirion tataricum, the species epithet by itself is a clue. It's a Tatar, a steppe bulb, in all likelihood. Yeah, dry summers, and minimal rains, and lousy soil, and good drainage and maybe cold winters--really cold, and lots of limestone in the soil, and sharp drainage, (either that and a sloping clay or terra rossa base where the water drains off before it soaks in very much..) Of course this doesn't work for Scilla peruviana!--but we've been over that more than once.