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At a craft workshop this weekend in the arboretum, you won't start getting crafty until after you have collected natural materials to get crafty with.

The Cross-Pollination: Art-Nature Workshop, open to all ages, will explore the relationship between creativity and the natural world.

Participants will collect natural materials in the Shields Oak Grove, then "make art and discover what happens when we encourage cross-pollination between art and nature."

Presented by the arboretum and the Davis Art Center. 10 a.m.-noon Sunday, July 15, .

MORE AT THE ARBORETUM

Folk Music Jam Session — Pull out your fiddles, guitars, mandolins, penny whistles, pipes, flutes, squeezeboxes — you name it! — and join your fellow musicians during the lunch hour for a little bluegrass, old-time, blues, Celtic, klezmer and other world music. All skill levels welcome. Listeners, too! Noon-1 p.m. Friday, July 20, and Aug. 3, 17 and 31. .

Tired of Mowing Your Lawn? — Save water, energy and money with a sustainable home landscape. A "how-to" program on converting from lawn to low-water, low-maintenance, beautiful plantings. 10-11:30 a.m. Saturday, July 21, Nature's Gallery Court (Garrod Drive, just east of the ).

Armchair Birding: Plants in Your Yard, and the Feathered Friends Who Visit — Learn how to attract birds to your garden, and what species might fly in — bringing sound and movement to your yard. 9-10:30 a.m. Saturday, Aug. 4, , next to the former Borders bookstore in the Davis Commons shopping center, First Street and Richards Boulevard.

The Redwood Grove, So Cool! — Enjoy the cathedral-like cool and quiet of the redwood grove and learn about the plants of the redwood forest understory. 9-10:30 a.m. Saturday, Aug. 18, .

All programs are free and open to the public. More information on arboretum events: (530) 752-4880 or (for directions, click on “Plan Your Visit”).