Triple Crown Blackberry Jam

“Rip out those plants, Mom!” my daughter told me. “They’ll totally take over!”

She meant the alien-looking blackberry canes towering over one of my Marionberry rows. The monstrous canes don’t sprawl over the ground like the Marions but stand erect, as tall as fifteen feet. Each cane is as thick as a sapling, and thornless. The leaves aren’t blotched with rust like those of the Marions but solid green, the picture of health.

The fruit is different, too. Whereas Marionberries are long, slender, and soft, these other blackberries are big, round, firm, and glossy. They lack the sour, bitter, winy notes of Marionberry; their taste is frank Himalaya, with a little less acid. They ripen with the wild Himalaya, too, starting at the end of the Marions’ season.

It’s the resemblance to the Himalaya that scares my daughter. We love this most common wild blackberry, but it’s so invasive that we rip out every start except along the irrigation ditch and at the far edges of the wheat field. The new blackberry plants in the row with the Marions aren’t spreading, though, at least not yet. They stay in two tidy clumps, lightly attached to wires just to be sure the plants won’t topple over in the wind (they’re technically considered “semi-erect”).

These plants are the Triple Crown blackberry, a variety jointly developed by USDA breeders in Oregon and Maryland. Released for sale in 1996, the variety is starting to get popular both in and beyond the Pacific Northwest and the mid-Atlantic states. Triple Crown is named for its three “crowning attributes”: flavor, productivity, and vigor. But the variety has two other wonderful attributes, and they’re the ones that will keep me from ripping out the plants: disease-resistance and thornlessness. With western Oregon’s long, cool wet season, disease-resistance is all-important. And I never miss the pain of tiny blackberry thorns in my fingers.

Still, my daughter has a complaint unmentioned in the berry trial reports: “The seeds are too big. They stick in my teeth.” So I decide to make the Triple Crowns into one of her favorite jams, seedless blackberry.

Triple Crown Blackberry Jam
Makes about 3 pints

Although you could use a different blackberry variety in this recipe, I’ve written it especially for Triple Crowns. These berries are relatively low in acid, so I use a little more lemon juice than usual. And because the berries are so large and firm, I cook them before putting them through the food mill.

3 pounds Triple Crown blackberries
3 2/3 cups sugar
3 tablespoons lemon juice

In a broad, heavy-bottomed, nonreactive pot, simmer the berries, covered, until they are tender and most of their juice is rendered, about 10 minutes. Then put the berries through the fine screen of a food mill.

In the pot, combine the berry purée with the sugar and lemon juice. Heat the mixture over medium heat, stirring, until the sugar is dissolved. Turn the heat to medium-high, and boil the jam until a drop mounds in a chilled bowl. (The spoon test will work with this jam, too; when the jam is ready, two drops will run together off the side of a spoon.)

Remove the pot from the heat. Ladle the jam into sterilized jars, and process them in a boiling-water bath for 5 minutes.

Once my daughter has tasted this luscious, dark jam, I hope, she’ll never again complain about my monster blackberry plants. In the next year or two, I may be ripping out Marions to make room for more Triple Crowns.

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About Linda Ziedrich

I grow, cook, preserve, and write about food in Oregon's Willamette Valley.
This entry was posted in Fruits, Sweet preserves and tagged , , , , , , , . Bookmark the permalink.

3 Responses to Triple Crown Blackberry Jam

  1. kathy says:

    my mother has a couple of these canes that have grown taller than the grape arber next to it. They are a fav added to raspberries to make juice all summer long as well as so prolific that we all get many bags added to our freezers for the winter juice making. But the one thing that everyone looks forward to is the dessert she usually brings along on xmas or thanksgiving. First you get the largest glass oven proof container like a lasagna dish or an other large pyrexy thing either make a graham crust, or a pie crust, (either way is good, though the graham is particularly sweet and soaks up the remains for days after for snacking and sweet breakfasts with coffee) pre bake either crusts. Make a berry composition like a lemon meringue pie filling. (remove the seeds obviously) then top with meringue. A whipped cream top is just wayyyy toooo sweet. The filling is usually about an inch. I really have to get her recipe before it’s lost to the ages.

  2. Pingback: Frozen Blueberries & Fresh Rhubarb Jam

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