Most alfalfa plants wither and die once the weather becomes cooler, this was the case for Wendelin's plants as well, except just for a few that managed to survive. The seeds of these plants that did survive the harsh winter were then picked by Grimm and replanted again the next farming season. As these seeds that survived were replanted every year, more and more plants lasted through the winter as they grew accustomed to the cold, until eventually, every plant flourished year-round. By using the process of natural selection, Grimm had created North America's first strain of alfalfa that was winter-hardy. This alfalfa began to be used by hundred of farmers, and soon Grimm Alfalfa was a household word in all farmhouses in the mid-west.
In the 1960s, when the Carver Park Reserve was established, Wendelin's farm property was also acquired and became an important subject of preservation. Thanks to the Minnesota State Preservation Office, the historic home was repaired and by 2001, it was finally ready to open to the public. This agricultural history center is now used to teach guests about the accomplishments of Wendelin Grimm and how he contributed to the agricultural industry of North America. On Saturdays and Sundays, visitors can enjoy free guided or self-guided tours through the home, where they can gain new understanding of the important relationship between farm land and people.