I drive down my semi-rural roads each year flinging seeds and seed pods from my car windows. Mostly swamp milkweed, white and purple, since uber-slow-to-establish Sullivant's has yet to bloom for me. May they grow along the edges of fields and in gullies and give life to hundreds of monarchs!
Speeking of caterpillars, I had no idea that Zizia aurea (Golden Alexander) was a host plant for black swallowtails. This midwest native gets yellow flowers similar to bronze fennel and grows to about 2-3' tall in moist soil. I just happened to be looking down at the plant that brushed my leg, and there on the end of a stem near the developing seeds was a 3rd or 4th instar swallowtail. Marvelous! Hope it self sows freely.
And today is a sad day. It is August and it is cold. This is Nebraska. It should be 90, not 68 and cloudy with a north breeze. Methinks the asters and goldenrod may just decide not to bloom, and the budding sweet autumn clematis will simply climb off the arbor and scamper south.