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Another monarch imposter in NorCal gardens


The gulf fritillary is often mistaken for a monarch butterfly. (Courtesy Dr. Shapiro via FreeClipartPictures.com)


Gulf fritillary seeks its favorite plant: Passion flowers


This butterfly has a passion for passion flowers.

Just as monarchs must have milkweed, the gulf fritillary is dependent on Passiflora , the passion vine. And like the painted ladies, this orange-and-black butterfly is often mistaken for the vanishing monarch.

Butterfly expert Dr. Art Shapiro of UC Davis often gets calls or emails about misidentified fritillary sightings.

"The gulf fritillary has silver spots, but it's a big orange and black butterfly, too," he said. "Unless people notice the silver spots, they think it's a monarch, too."

Shapiro notes that the gulf fritillary was nonexistent in the Sacramento area for decades after a hard frost in the 1970s killed all the available passion vines as well as overwintering butterflies.

"It's a subtropical species that likes to eat a tropical plant; there are no native passion flowers in California," he explained. "It's not adapted at all to our area. It got down to 21 degrees and wiped out the whole population."

Gulf fritillary butterflies started showing up again about 10 to 13 years ago, he estimated. They've been spotted in Davis, North Sacramento, Rancho Cordova, West Sacramento, Suisun, Fairfield, Folsom, south Sacramento and several other spots.

How the first gulf fritillary arrived in California is a mystery. As its name implies, it prefers the Gulf of Mexico.

"The first one was identified in Southern California in 1875," Shapiro said."It must have come from somewhere back east."

One was spotted in the Bay Area in 1908, but these butterflies didn't really move in until the 1950s. Since then, a large colony has made Berkeley its year-round home.

A sure sign of happy fritillary is a passion vine with chewed-up leaves.

Shapiro recalled a passion vine that grew behind a Davis restaurant. "It was a big vine and every leaf was eaten," he said. "Downtown Davis was full of gulf fritillaries for weeks."

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Dig In: Garden Checklist

For week of March 24:

In between cloud bursts, try to catch up with early spring chores. 

* Attack weeds now! Get them before they flower and go to seed. Take a hoe and whack them as soon as they sprout. Aim for 1 inch below the soil line.

* Start preparing vegetable beds. Spade in compost and other amendments.

* Prune and fertilize spring-flowering shrubs after bloom.

* Feed camellias at the end of their bloom cycle. Pick up browned and fallen flowers to help corral blossom blight.

* Feed citrus trees, which are now in bloom and setting fruit. To prevent sunburn and borer problems on young trees, paint the exposed portion of the trunk with diluted white latex (water-based) interior paint. Dilute the paint with an equal amount of cold water before application.

* Feed roses with a balanced fertilizer (such as 10-10-10, the ratio of nitrogen, phosphorus and potassium available in that product).

* Prune and fertilize spring-flowering shrubs and trees after they bloom. Try using well-composted manure, spread 1-inch thick under the tree. This serves as both fertilizer and mulch, retaining moisture while cutting down on weeds.

* Cut back and fertilize perennial herbs to encourage new growth.

* Seed and renovate the lawn (if you still have one). Feed cool-season grasses such as bent, blue, rye and fescue with a slow-release fertilizer. Check the irrigation system and perform maintenance. Make sure sprinkler heads are turned toward the lawn, not the sidewalk.

* In the vegetable garden, transplant lettuce and cole family plants, such as cabbage, broccoli, collards and kale.

* Seed chard and beets directly into the ground.

* Plant summer bulbs, including gladiolus, tuberous begonias and callas. Also plant dahlia tubers.

* Shop for perennials. Many varieties are available in local nurseries and at plant events. They can be transplanted now while the weather remains relatively cool.

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