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: Learn more about water conservation on April 2 with Irrigation Maintenance--Preparing For Summer. These free demonstrations are held in the open and last about one hour. Call 626-5161 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 April 1 John Begeman presents Crash Course--Educate Yourself Before Hiring A Professional. Call 1-520-648-0808 for information. Out Of Town BOYCE THOMPSON ARBORETUM. Take a drive up to Boyce Thompson Arboretum for a beautiful change of pace. Spring is in full bloom and the Arboretum is celebrating with Spring Color Weekend Tours at 11:30 a.m. Saturday and Sunday, Spring Blooming Displays and more. Their annual Spring Plant Sale continues through April 6, with many desert-friendly plants, including species introduced by the Arboretum. Call 1-520-689-2723 for directions to the Arboretum and information.

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