Baptisia australis
This nitrogen fixing perennial is a must have in your landscape. It will reach heights of up to 4' with a similar spread while simultaneously adding nitrogen to your soil! Blue spikes of flowers erupt in the spring providing food for our pollinators. 
 
*note, legumes harbor rhizobia in their root zones that enable nitrogen fixation in your soil, all legumes from Driftless Area Natives LLC are sold pre-inoculated