GARDENING BOTANICAL GARDENS. The Tucson Botanical Gardens, 2150 N. Alvernon Way, is open from 8:30 a.m. to 4:30 p.m. daily. Nursery hours are 9 a.m. to noon Tuesday through Saturday. Guided tours of the gardens are offered at 10 a.m. Wednesday and Saturday. Other regular attractions include the following: "Birds and Gardening" tours at 9 a.m. Tuesday; "Gardening for the Newcomer," a monthly class from 9:30 to 11:30 a.m.; a plant clinic from 11 a.m. to 1 p.m. Saturday; 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 1 to 4 p.m. Monday, Wednesday and Friday. Admission to the Botanical Gardens is $3, $2 for seniors, and free for children under 12. Call 326-9255 for information. TUCSON ORGANIC GARDENERS. The monthly meeting will be at 7 p.m. Tuesday, January 16, at TBG Porter Hall, 2150 N. Alvernon Way. Mike "Merk" Merkwan explains Soil Preparation for Spring Planting. The Master Composters of the Tucson Organic Gardeners staff a compost maintenance site at TBG with master composters on site from 9 a.m. to 1 p.m. every Saturday to answer all of your composting questions. Call the Compost Assistance Line at 798-6215; or call 883-0377 for information on monthly lectures.

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