With spring quickly approaching, it is the ideal time to plan a summer garden in California. Tomatoes, peppers, eggplant and squash are common and relatively easy to grow. But gardening veterans and rookies alike may want to add some ethnic flavor by cultivating tomatillos.

UC Cooperative Extension advisor Maria de la Fuente said she has planted tomatillos in her backyard garden every year since she moved to California from Monterrey, Mexico, in 1995. De la Fuente serves UC Agriculture and Natural Resources in various roles. She is the director of UCCE in Monterey County, an advisor to commercial specialty vegetable producers in Monterey, San Benito and Santa Clara counties, and the Master Gardener coordinator in Santa Clara County. She said she personally uses tomatillos regularly to make fresh green salsa, green pico de gallo and flavorful traditional sauces for dishes like chili verde.

“You could use green tomatoes, but it doesn't taste the same,” de la Fuente said. “There's really no substitute.”

Tomatillos are native of Mexico and a staple of Mexican cuisine. De la Fuente, who lives in Santa Clara County, said she starts seeds indoors in March and transplants into her garden in mid-May with great success.

“They grow like weeds, but I also buy a lot in the store,” de la Fuente said. “I make a lot of green salsa.”

Tomatillos, small green or green-purple to red fruits that mature inside paper-like husks, can be a healthful addition to family meals, according to the UC CalFresh nutrition education program, which developed a fact sheet in English and Spanish for cooking and eating tomatillos. Tomatillos contain Vitamin C, Vitamin K and potassium and are naturally low in calories.

Purple and red-ripening cultivars often have a slight sweetness; green- and yellow-ripening cultivars are more tart. Both types can be used for salsas and sauces. The fruits are white inside and meatier than tomatoes, which are in the same family, but a different genus.

To grow tomatillos, spread seeds on moist soil in an egg carton or shallow tray, place in a sunny location inside and keep the soil moist. When the plants are about six inches tall, transplant about three feet apart into garden soil that has been mixed with compost or humus. Select an area where they will get plenty of sun and be sure to plant more than one as two or more are required for proper pollination. The plants will grow to about 3 or 4 feet high and will need support to keep the fruit off the ground.

Tomatillos look like delicate Chinese lanterns on the vine. They are ready to harvest when the fruit fills and splits the husk, but leave the inedible husk on until use. Tomatillos may be kept in a brown paper bag in the refrigerator for about two weeks. For preservation, they may be frozen fresh or cooked. Prepared tomatillo salsa, chutney, relish, jam and sauce may be preserved using boiling water or pressure canning methods.

To prepare tomatillo sauce, gently squeeze the vegetable from the husk. Wash in cool, running water to remove stickiness from the skin. Sauté 2 cups chopped tomatillos, 1 diced onion and 1 diced garlic clove in 2 tbsp. oil. Add ¼ cup of water and heat until the vegetables are soft. Purée in a blender. De la Fuente suggests adding fresh cilantro to enhance the flavor of the sauce.

The CalFresh fact sheet says parents may feed children 6 months of age and older cooked tomatillo and sweet potato puree. Toddlers may be offered small pieces of cooked tomatillos and carrots. Older children may enjoy the vegetable served with cooked potatoes and onion as a burrito filling, or the pureed sauce as a dip with quesadillas, bread or raw vegetables.

An initiative to maintain and enhance healthy families and communities is part of UC Agriculture and Natural Resources Strategic Vision 2025.