Here's a link on plants that attract beneficial insects:
At least one of the recommended plants is highly invasive however, and exotic, so I ask you to not go there. The plant is Daucus carota, Queen Anne's Lace. Also, note that Maximilian's, or Prairie Sunflower, is native to Minnesota, so plant away ! Some references show this species as needing cold moist stratification to break dormancy on the seeds. However, I found the seeds sprouting in the bag in my refrigerator after just over a week or so of this treatment, so it doesn't need as long as may be recommended. And it may not need any stratification at all, though I haven't tried that. It could also be considered invasive, though native.
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