Welcome to Sleepy Hollow State Park. This cache, HH2025-Dwarf Lake Iris, was placed for the Haunted Hollow 2025 Event on August 16, 2025. This year's theme is Michigan Flowers.
This perennial plant is endemic to the Great Lakes area, meaning it doesn’t naturally occur anywhere else in the world. It is almost exclusively found along the northern shores of Lake Michigan and Lake Huron. From mid-May through June this plant blooms with one to two flowers that come in many shades of purples and blues, usually no larger than 2 inches in size. This small but beautiful flower is also Michigan’s state wildflower.
The dwarf lake iris is listed as threatened both federally and in the state of Michigan. Its natural habitat along high water lines has been disrupted by shoreline development and the plant has also been impacted by chemical spraying and salting. Maintaining natural shoreline habitats can help stop the threat to the dwarf lake iris.
This cache is located just off one of the many trails located in Sleepy Hollow. Most of the trails are well groomed and hard packed making a bike a great way to get to the caches in the area. Keep in mind during hunting season to be aware of hunters in the area. Hunting is allowed from September 15 until April 1st each year, so please be careful and dress appropriately when hunting is allowed.
A Recreation Passport is required for all vehicles entering Sleepy Hollow State Park. They are best purchased with your Michigan license plate, but are also available at the park. Camping is not available in the park this summer.