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Our blue heaven

Until recently, finding commercial blueberry farms in California would have been about as likely as finding a herd of moose. Blueberries traditionally were adapted to northern forests, and it took an extraordinary confluence of scientific advances, daring growers and market forces to fuel the great California blueberry boom of the last decade.

As recently as 1997, California grew only 196 acres of blueberries but now it has about 4,500, which are estimated to yield more than 20 million pounds this season. That’s still well short of Michigan, the nation’s largest producer at 110 million pounds last year. But when California’s plantings mature, its production may reach 50 million pounds, exceeding Oregon’s, now the third-largest U.S. producer.

All of this has not come easily, however. It’s taken the help of some long-lost heat-loving relatives from Florida, a slew of technical tricks and even a couple of exotic falcons to make it happen.

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Indigenous peoples across North America have gathered blueberries and related species in the genus Vaccinium for millenniums. But the classic blueberries of commerce, a type called northern highbush, were domesticated just a century ago in New Jersey; they require cold winters, and moist, acidic soil rich in organic matter, as in their native forests. Such conditions occur rarely in California and, when they do, it’s mostly in northern coastal districts.

Surprisingly, however, most other Vaccinium species are tropical, and the ancestors of blueberries probably arose in South America and migrated through the Caribbean islands to Florida and up the Eastern Seaboard. Florida has several wild species well adapted to warm winters, but with fruits that can be small, seedy or bitter.

Starting about 1950, breeders crossed these with northern highbush varieties to create a new low-chill type with large, tasty fruit, called southern highbush. The first such varieties, introduced in 1976, had commercial drawbacks, but beginning in the 1990s, Paul Lyrene, a University of Florida breeder, released a series of improved varieties that revolutionized blueberry cultivation in warm climates.

A visionary Oregonian, David Brazelton of Fall Creek Farm & Nursery, started promoting blueberries to skeptical San Joaquin Valley farmers in 1985; for many years, however, the results seemed unpromising, largely because growers had not yet mastered soil preparation techniques, which required adding tons of sulfuric acid solution and mulch per acre.

“You couldn’t just stick blueberries in the ground and grow them,” says Tom Avinelis, who farms 400 acres of the fruit in the southern San Joaquin Valley. “The plants would look a bit sick in the afternoon, and they’d be dead the next morning.”

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The breakthrough

Around 1997, Brazelton discovered a fix for San Joaquin water-quality issues that were exacerbating the problem. “It released the plants from prison,” he says.

The learning curve was still steep, as farmers gradually became proficient in site and variety selection, pruning and irrigation, but starting in the late 1990s, blueberry cultivation really began to take off.

Costs for growing and harvesting are high in California, compared with other areas, but so are the prices the berries get at market, due to fortuitous harvest timing. Coastal California blueberries start as early as February and peak in April and May; the San Joaquin crop begins in early May and peaks in late May and early June.

“It’s all about timing and market window,” Avinelis says.

Adding momentum to the boom, blueberries are a rich source of antioxidants, especially anthocyanins, and their perception as a healthful, convenient fruit has boosted demand around the world.

How do California blueberries compare with those from traditional northern growing areas? Surprisingly, there’s not much difference in flavor between the northern and southern highbush types. Compared with the earliest northern varieties, the southern varieties are larger, firmer, milder and sweeter, with less of a wild tang, but that’s also true of some modern northern varieties. California’s constant sunshine may make our berries sweeter, but in general, the most crucial determinants of quality are proper ripeness and storage.

There are considerable differences, however, among southern highbush varieties, but varieties unfortunately are almost never identified at markets; the only way to choose is to grow your own or visit a U-pick farm. Two of the best varieties are Misty and Southmoon, each of which offers a good balance of sweetness and acidity, and a complex flavor.

Of the leading commercial varieties, grown for their productivity, Emerald tends to be tart and very large, while Jewel is sweeter and softer.

Coastal farms in Southern and Central California account for only 600 acres of blueberries, mostly in small plantings, but have a reputation for premium quality because the mild climate allows the fruit to mature over a longer period and thus develop richer flavor. The plants typically remain evergreen, instead of going dormant, as they do in most other areas; Randy Pudwill, a grower in Nipomo, produces fruit virtually year-round in hoop houses.

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But no cakewalk

Most of California’s blueberry acreage is in the San Joaquin Valley, where one grower, Delano-based Munger Farms, has 1,600 acres. Although in summer this is the warmest blueberry-growing area in the world, the plants, with their Florida heritage, do fine. Still, when it’s 105 degrees during harvest in June, it can be difficult and expensive for farmers to pick the berries before they turn soft.

The Mungers have placed their largest bet, 1,000 of those acres, on new plantings farther north near Stockton, where the soil is naturally suited for blueberries, it’s a bit less torrid during harvest, and there’s enough winter chill to grow some northern highbush varieties.

“In the long run, the fruit quality in Stockton will be better,” Kable Munger says.

Cold can be as much of a problem as heat. Breeders have introduced ultra-early-ripening varieties that bloom very early and are thus susceptible to spring frosts. All growers can do to prevent this is turn on sprinklers, which warm the air slightly, and pray.

Birds such as starlings and waxwings particularly relish blueberries and can devour thousands of dollars’ worth in a few hours. To protect his crop, Munger hires a falconer who roams the fields in his pickup from sunup to sundown, scaring off the marauders with three trained aplomado falcons.

Ultimately, the greatest challenge to growers may be surging supply, both in California and worldwide. In mid-May, California blueberries were selling at wholesale for only about $3.50 a pound, near the cost of production. Labor accounts for about 70% of this cost and as retail prices come down, some growers say the only way they’ll be able to survive is by machine harvesting -- usually done at night when the fruit is cooler and firmer.

Clearly, California blueberries have come a long way from the northern forests. And while industrialized production may have diluted some of the romance of their wild origins, it’s still worth remembering, when you see local blueberries at the market, the heroic efforts that it took to get them there.

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food@latimes.com

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Lemon blueberry buckle

Total time: 1 hour, 15 minutes

Servings: 6 to 8

Note: Adapted from “Rustic Fruit Desserts” by Cory Schreiber and Julie Richardson.

Crumb topping

1/2 cup flour

1/3 cup sugar

1/8 teaspoon salt

Zest of 1 lemon

1/4 cup ( 1/2 stick) butter, cubed, at room temperature

In a medium bowl, whisk together the flour, sugar, salt and lemon zest. Add the butter, using a fork or your fingers to cut in the butter until it is reduced to the size of peas. Loosely cover the bowl, and place it in the freezer while you mix the cake batter.

Cake and assembly

6 tablespoons butter, at room temperature, plus extra for greasing the pan

1 1/2 cups plus 2 tablespoons flour

1 teaspoon baking powder

1/4 teaspoon baking soda

1/2 teaspoon salt

1/4 teaspoon freshly grated

nutmeg

3/4 cup plus 1/3 cup sugar, divided

Zest of 1 lemon

2 eggs

1/2 cup buttermilk

2 cups blueberries, fresh or frozen, divided

Crumb topping, chilled

Juice of 2 lemons (about 6 tablespoons)

1. Heat the oven to 350 degrees. Lightly grease a 9-inch square baking pan.

2. In a medium bowl, whisk together the flour, baking powder, baking soda, salt and nutmeg.

3. In the bowl of a stand mixer, or in a large bowl with a hand mixer, cream together the butter, three-fourths cup sugar and lemon zest until light and fluffy, 3 to 5 minutes. Add the eggs, one at a time, scraping down the sides of the bowl after each addition.

4. Stir the flour mixture into the bowl, a third at a time, alternating with the buttermilk, until both the flour mixture and buttermilk are evenly incorporated into the batter. Gently fold 1 cup of the blueberries into the batter.

5. Spread the batter into the prepared pan and distribute the remaining blueberries evenly over the top of the batter. Remove the crumb topping from the freezer and sprinkle it over the berries.

6. Bake the cake until it is lightly golden and firm on top, and a toothpick inserted in the center comes out clean, 45 to 50 minutes. Rotate the pan halfway through for even baking.

7. While the cake is baking, make a lemon syrup: In a small saucepan, combine the remaining one-third cup sugar with the lemon juice and whisk until blended. Heat the pan over medium-low heat and cook, stirring occasionally, until the liquid thickens to a syrupy consistency, 6 to 8 minutes. (The glaze will bubble while cooking and may need to be removed from the heat to check that it is the proper consistency.) Remove from heat and set aside in a warm place.

8. Remove the cake from the oven and drizzle the warm glaze over. Cool to room temperature. The cake will keep at room temperature for 2 to 3 days, covered in plastic wrap.

Each of 8 servings: 436 calories; 6 grams protein; 69 grams carbohydrates; 2 grams fiber; 16 grams fat; 10 grams saturated fat; 92 mg. cholesterol; 319 mg. sodium.

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Blueberry fool on a berry fruit salad

Total time: 15 minutes, plus 2 hours resting time for the salad

Servings: 6

Note: Adapted from “Ten: All the Foods We Love . . . and Ten Recipes for Each” by Sheila Lukins. Assemble the blueberry fool no more than 2 hours prior to serving.

Berry fruit salad

1 pint fresh blueberries, lightly rinsed and patted dry

1 pint fresh blackberries, lightly rinsed and patted dry

2 tablespoons fresh lemon juice

2 tablespoons sugar

2 tablespoons chopped fresh mint leaves

In a large, nonreactive bowl, combine the blueberries, blackberries, lemon juice and sugar. Let the mixture rest for 2 hours at room temperature for the juices to develop. Shortly before serving, toss the berry mixture with the chopped mint. While the salad is resting, prepare the fool.

Blueberry fool and final assembly

1 pint (2 cups) fresh blueberries, lightly rinsed and patted dry, divided

1/4 cup plus 3 tablespoons sugar, divided

1 1/2 cups heavy (whipping) cream

1 teaspoon vanilla extract

1/2 cup creme fraiche

6 full mint sprigs, for garnish

1. In a small saucepan, place 1 cup of the blueberries and one-fourth cup sugar over medium-low heat. Cook, stirring occasionally until the sugar has dissolved and the berries have softened, about 10 minutes. Remove from heat and transfer the berries to a medium bowl to cool completely. (To speed the process, chill the berries in the refrigerator for about 20 minutes or about 5 minutes in the freezer.) Add the remaining cup blueberries to the cooled blueberries and set aside.

2. While the berries are cooling, in the bowl of a stand mixer or in a large bowl using a hand mixer, whip together the cream, remaining 3 tablespoons sugar and vanilla to form soft peaks. Add the creme fraiche and continue beating until it is combined and the mixture again forms soft peaks.

3. Using a large rubber spatula, gently fold the blueberries into the whipped mixture, being careful not to overmix. (You want to create a marbleized effect.) Refrigerate, loosely covered, for up to 2 hours before serving.

4. To serve, spoon about one-half cup of the fruit salad into each of 6 dessert bowls, and top with a generous portion of the fool. Garnish each portion with a mint sprig.

Each serving: 392 calories; 3 grams protein; 41 grams carbohydrates; 5 grams fiber; 26 grams fat; 16 grams saturated fat; 91 mg. cholesterol; 37 mg. sodium.


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