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My best guess is that it will bloom for you next year. Sometimes perennials need a little extra time to settle in. My lavender blooms in early summer, here, and is generally done by the end of June.
The first year, it's probably better to pinch and prune for shape and fullness anyway, rather than letting it flower. Just like the basil in the article, lavender will branch when it is pinched back. Just be sure to allow several weeks between the last time you pinch and your average first frost date.
I'll put together an article on lavender down the road... :-)