GARDENING BOTANICAL GARDENS. The Tucson Botanical Gardens, 2150 N. Alvernon Way, are open daily from 8:30 a.m. to 4:30 p.m. The TBG nursery is open from 9 a.m. to noon Tuesday through Saturday. Guided tours of the gardens are at 10 a.m. Wednesday and Saturday. Regular attractions include Birds and Gardening tours at 9 a.m. Tuesday; Gardening for the Newcomer from 9:30 to 11:30 a.m. the first Thursday and third Saturday of the month; the Native Seeds/SEARCH mini-museum of ethnobotanical displays, open 10 a.m. to 4 p.m. Tuesday and Thursday; and the TBG library, open from 1 to 4 p.m. Monday, Wednesday and Friday. Regular admission to the gardens is $4, $3 for seniors, and free for members and children under 12. Call 326-9255 for information. COMPOST DEMONSTRATION. The Master Composters of the Tucson Organic Gardeners staff a compost demonstration site at the Tucson Botanical Gardens from 9 a.m. to 1 p.m. every Saturday to answer your composting questions. Call the Compost Assistance Line at 670-9158; or 883-0377. GARDENING DEMONSTRATIONS. The following demonstrations are given at 9 a.m. Wednesday at the Extension Garden Center, 4210 N. Campbell Ave.; and at 1 p.m. Wednesday at the Wilmot Library, 530 N. Wilmot Road: On March 5, learn what you need to know about Planning and Planting Trees and Shrubs. These free demonstrations are held in the open and last about one hour. Call 626-5161 for information. GARDEN EXPO. Tohono Chul Park. 7366 N. Paseo del Norte. 742-6455. There will be something for everyone at the first annual Plant Sale and Garden Expo from 10 a.m. to 4 p.m. Saturday and Sunday, March 1 and 2. Visit special exhibits including a Wildflower Booth, a Foods of the Desert table, and be sure to stop by one of the special visitor's tables manned by representatives from the Forgotten Pollinators Campaign, the Sonoran Arthropod Studies Institute, the Arizona Native Plant Society, and the University of Arizona's Water Resources Research Center. Throughout the weekend Park Grounds Curator Russ Buhrow and Horticulturist Bruce Evans will offer a series of mini-lectures for the seasoned gardener to the desert novice. Call 742-6455 for information. GREEN VALLEY GARDENING. Green Valley Baptist Church. 1111 N. La Cañada. The Green Valley Cooperative Extension presents a series of free gardening lectures and demonstrations on Tuesdays at 9:30 a.m. On March 4, John Begeman presents Weed and Pest Control. Call 1-520-648-0808 for information. SEED DAY. Tucson Botanical Gardens. 2150 N. Alvernon Way. Join Native Seeds/SEARCH for their Spring Seed Day from 10 a.m. to 3 p.m. Saturday, March 1. There will be seeds of native crop varieties including corn, beans, and squash, as well as all the foods and books featured in Native Seeds/SEARCH's 1997 Seedlisting. There will also be a variety of seedlings and Native American arts and crafts available. Arrive early for a Spring Planting Workshop for beginning desert gardeners, from 8 to 10 a.m. at the Sylvester House. Cost for the workshop is $12, $10 for Native Seeds/SEARCH members, and pre-registration is required. Call 327-9123 for registration and information.

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