Garden Grove Township was created in 1850.

[1] Garden Grove Township covers an area of 35.73 square miles (92.5 km2); of this, 0.04 square miles (0.10 km2) or 0.12 percent is water.

The streams of Mormon Pool and Weldon Creek run through this township.

The township contains five cemeteries: Doze, Garden Grove, Metier, Morman and Winters.

This article about the geography of Decatur County, Iowa is a stub.