Over time, the little bombs will grow into herbs and flowers that provide habitat and food for pollinators. Spring is the best time to "plant" them, to mimic what happens when these plants naturally produce seeds.
Let nature take its course, and the seeds will germinate when conditions are good. Be patient - some of these plants may not bloom the first year, but will reward you with more blooms in subsequent years!
You can buy Bee Seed Bombs in a bag of 6 from the Banish store.