Last year my allium plants didn't bloom. Foilage was healthy and tall and some foliage formed seed pods on top instead of blooms. In the fall after frost I cut down the foliage and covered with a few inches of mulch. The foliage is now peeking through the mulch even though the nights are still pretty cold here in Boise Idaho. Is there anything I should be doing to ensure blooms this year?
Nothing much you can do; mother nature calls the shots. If you had seed pods, you had blooms. As the old song goes, you can't have one without the other. They may have been short-lived or lower than usual due to weather. Are you confident that you planted them at the correct depth?