Chalk it up to climate or to pride of ownership, but Southern California has exceptionally vibrant home, garden and architecture tours. At movie palaces in downtown Los Angeles as well as wildflower patches in our farthest-flung suburbs, doors and gates are open for visitors' admiration and critiques.

January

Baiko-En Bonsai Kenkyukai Show and Sale: Demonstration on how to transform ordinary nursery plants into classic miniaturized bonsai. Los Angeles County Arboretum & Botanic Garden, 301 N. Baldwin Ave., Arcadia. (626) 821-4623 or http://www.arboretum.org .

February

Camellia Festival: Descanso Gardens' annual show with sales and lectures at 1418 Descanso Drive, La Cañada Flintridge. (818) 949-4200 or http://www.descansogardens.org .

March

Pasadena Heritage Spring Home Tour: Tour of five privately owned historic homes in Pasadena. (626) 441-6333 or http://www.pasadenaheritage.org .

Lilac Festival: Show, sales and lectures. Late March or early April at Descanso Gardens. (818) 949-4200 or http://www.descansogardens.org.

Ikebana International Show: Japanese flower arranging. Los Angeles County Arboretum & Botanic Garden. (626) 821-4623 or http://www.arboretum.org .

April

AIA Home Tours: The L.A. office of the AIA hosts two tours a year: one in the spring and one in the fall. This month included a look at Beverly Hills homes; planned for the fall are a Sept. 17 tour of Silver Lake and Echo Park and a Westside tour Oct. 22. (213) 639-0777 or http://www.aialosangeles.org.

Theodore Payne Native Plant Garden Tour: Native gardens throughout the Los Angeles Basin. (818) 768-1802, or http://www.theodorepayne.org.

Open Days: Garden Conservancy's annual tour of gardens in the Los Angeles and Pasadena areas. Also in May. http://www.gardenconservancy.org/opendays/.

California Poppy Festival: Each year this festival spotlights the colorful poppies, which are an Antelope Valley springtime attraction. Lancaster City Park, 43011 N. 10th St. W., Lancaster. http://www.poppyfestival.com .

Bungalow Heaven Home Tour: Self-guided walking tour of historic Arts and Crafts-era homes in Pasadena's first landmark district. Today. (626) 585-2172 or http://www.bungalowheaven.org.

Garden tour: The Creative Arts Group's annual Art of the Garden tour through San Marino. (626) 355-8350 or http://www.creativeartsgroup.org.

Green Gardens Tour: The Virginia Avenue Project sponsors this tour of private gardens that have become ecologically sound. (310) 264-4224 or http://www.virginiaavenueproject.org.

Rose Show and Sale: Los Angeles County Arboretum & Botanic Garden. (626) 821-4623 or http://www.arboretum.org.

May