by Roy Lukes

A Rare and Delectable Berry

Thimbleberry blossom
Thimbleberry flowers, now in bloom, will lead to ripening fruit in early August, prized for jam making.

This is the season when our third-of-a-mile round trip hike to the mailbox gets us to thinking about one our most favorite homemade jellies. As soon as the walk down our long driveway nears the road we begin looking for the strikingly white flowers of the wild blackberries. The high rainfall in recent weeks hopefully will result in a good crop of these luscious fruits later this summer. This berry, considered to be genuine ambrosia by nearly all people as well as many wild creatures, is known to be American’s most valuable wild fruit.

The Rubus (RUE-bus) genus, named after the Roman term "ruber" meaning red, includes 205 species of a small number of raspberries and many species of blackberries in the eighth edition of Gray’s Manual of Botany. Dr. Albert Fuller, long-time curator of botany at the Milwaukee Public Museum and a founder of the Ridges Sanctuary at Baileys Harbor, worked at better identification of the wild blackberries of Wisconsin during his retirement years, an extremely difficult genus to study.

Most of the blackberries are born on brambles that warrant one’s utmost respect. Being in the rose family, the flowers have five petals that usually are white. The black, shiny, sweet, berry consists of numerous drupelets, each with a seed, adhering to a juicy core. Canes are usually upright or arching and the leaves are greening beneath.

How I cherish the memories of going with my dad and two older brothers, Leo and Ivan, to a place north of Mountain, Wis. to pick wild blackberries. Dishpans, soup kettles, pails, all were brimming and the trunk of our 1937 Chevrolet was filled with the toothsome fruit when we arrived home late Sunday night. My mouth waters just thinking about the many jars of blackberries, blackberry jelly and jam my mother put up in those days.

Another member of the large Rubus genus became a favorite of ours around 40 years ago, the thimbleberry, Rubus parviflorus, (par-vi-FLOW-rus). Names of berries, by the way, can be quite localized. As a result you may find a dozen or more plants called thimbleberries. The one I refer to grows near the northeastern shore of Door County, generally north of Sturgeon Bay, ontoWashington Island, Rock Island, the Keweenaw Peninsula of Upper Michigan, Isle Royale National Park, and northward and westwa rd into the mountains.

Constant summer coolness and moisture are two of its important requirements. One reaches a specific elevation in, for example, the Rocky Mountains, where the moisture and lower temperatures are just right and there you will find thimbleberries doing very well.

It was while watching the early morning weather on TV quite a few years ago that Willard Scott held up a jar of thimbleberry jam and said to the effect, "Our viewing friends from the Keweenaw Peninsula sent this jar of jam and claim that the only place in the world where thimbleberries grow is on their great peninsula!" I would enjoy seeing the expressions on their faces upon visiting the northeastern shore areas of the Door Peninsula.

Leaves of this marvelous plant are unusually large, velvety and appear to have come from some kind of maple tree. Canes are smooth and have no thorns. The extremely tart, small-seeded fruits flatten when picked, ripen in early August and can be made into an extraordinarily delectable jam.

Our friend of years ago, Miss Emma Toft, who was a master at picking these unusual berries and transforming them into superb jam, offered us the following advice. First line your pail with a few fresh thimbleberry leaves and try to pick the berries clean. They are too fragile and difficult to pick over before making the jam.

Combine one cup of sugar with each cup of fruit, bring to a boil and immediately turn off the heat. Put into sterilized jars and you have, as Miss Emma would have said, "the jam with the pine woods flavor," the world’s finest.

The species name of the thimbleberry, parviflorus," means small-flowered and is rather poorly chosen. Actually this plant’s blossoms are very large, nearly the size of a silver dollar. They are still in flower in the more shady sites. Now is the time we like to scout out the areas where we’ll try to pick enough fruit this August for making a dozen or more half-pint jars of jam.

Years back we were introduced to an unusually excellent campfire treat. Friends had a pound cake which they sliced into quarter-inch-thick pieces. One half of each "sandwich" was spread with thimbleberry jam, followed by a few thin squares of chocolate, then completed with a couple of freshly toasted marshmallows, finally completed with the remaining slice of pound cake. Believe me, this produced a prize-winning, mouth-watering dessert fit for visiting dignitaries to the boreal forest!


This column appeared in the Door County Advocate on 07/03/2004.
© Copyright 2004 Roy Lukes. All rights reserved.