anza2821,

Aliums in general need no pre-chilling per say. The normal cold of winter should do fine. Now your zone 9 is admittedly getting a little far south for reliable blooming of most spring-flowering bulbs but Aliums aren't normally so picky, as they are a member of the onion family. Provide a well drained soil in full sun that has a lot of compost incorporated into it. Water them well and mulch them lightly. If the ground does freeze (which it shouldn't in zone 9), apply additional mulch to keep it frozen. Once they emerge in the spring apply a good quality slow release fertilizer (they are heavy feeders) and keep them watered regularly and mulched when it gets warm. Plan on staking them when they emerge next spring I personally like the green wire plant stakes). You will want to side-dress your Aliums with compost each fall and spring thereafter and plan on digging them every three years os so to divide them and rejuvenate the bed. The link below is a great source of information on all my gardening issues and I like their newsletter to.

Here is a link that might be useful: Gardening Resource