Do you have to freeze seed first or do you just put them in the ground?
Butterfly Bush Seeds
Certified GKH Gardening Expert
While they should be pre-chilled, the freezer is not the ideal place for that, as this will actually kill off the seeds. Place them instead in the refrigerator or another cool location. This article will also help: https://www.gardeningknowhow.com/ornamental/shrubs/butterfly-bush/propagating-butterfly-bush.htm