Unique wild flavors of a Red Raspberry. The Thimbleberry has the most unique flavor of all red raspberries. When I tasted these Wild Raspberries during one of my summer trips to the Keweenaw Peninsula in Northern Michigan, I knew I had to share the wonderful flavors with others. The local people in the Keweenaw describe the flavor of the Thimbleberry as a flavor of its own, being sweet with a zing of tart juices. Fruits are a good size varying from the size of a penny to a nickel. Eat the fruits fresh from the plants, or make some of the best raspberry jam ever tasted. The Thimbleberry plants have no thorns and grow to a height of up to 4 and 5 feet. The flowers are pure white and leaves are huge compared to other raspberries. Plants do make an attractive landscape plant for seasonal color. Hardiness Zones 4-8.