Hi Dave,
Basically, you can't get seed of a cultivar unless it happens to be a grex (a group of similar lilies, such as 'Golden Splendour', and then only if they're fertile). Most registered cultivars are clones and so must be propagated through tissue culture, scaling, bulblets, etc. You can always cross two similar clones and hope for similar offspring, but then it would be pod parent x pollen parent, not seed of the specific cultivar (and crossing two similar plants is no guarantee of similar offspring... one post somewhere here on hybridising mentions crossing two pinks and getting an orange!). My understanding is that you need to go through two or three generations from the first cross before you could be reasonably sure of a strain of similar-looking lilies.
