The first rule to flower arrangements is that there are no rules to flower arrangements:
Cullina suggests sowing rows of seeds in late fall and covering the seeds very lightly with soil or hay. "In spring, you'll see the seedlings come up in rows, and then you can thin them and transplant them." This method produces successful results with minimal hassle. Columbine (Aquilegia spp.), blue stars (Amsonia spp.), and members of the aster family (Asteraceae), including Joe Pye weed (Eupatorium spp.) and blazing star (Liatris spp.), generally germinate well with this method, Cullina says. Also, consider contacting a local wildflower organization and ask about wildflowers that grow well from seed in your area.
Related: 15 Native Wildflowers Every Gardener Should Plant