Where are the sunflower exactly?

There's a marker on Google maps that indicates where. It's labeled sunflower fields. There are some on two sides of the lake.

If you google badger creek van meter it will take u straight there

Try these coordinates. Pretty close to a parking lot. 41.4743969, -93.9193075

You can find the largest at the eastern entrance, but there are some on the western side of the park as well. If you want to avoid the crowds go west on R16.