GARDENING BOTANICAL GARDENS. Regular hours at the Tucson Botanical Gardens, 2150 N. Alvernon Way, are 8:30 a.m. to 4:30 p.m. daily. The TBG nursery reopens with the fall plant sale October 5 and 6. 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. Find out how and what to plant in your garden to attract butterflies at a workshop from 3 to 5 p.m. Saturday, September 28. Cost is $8, $6 for members. Pre-registration is required. Call 326-9255 for information. Regular admission to the gardens, through October 1, is $3, $2 for seniors, and free for members and children under 12. GARDEN DEMONSTRATIONS. Free one-hour demonstrations are offered by the Pima County Cooperative Extension at 1 p.m. Wednesdays at the Wilmot Library, 530 N. Wimot Road. On Wednesday, October 2, learn what you need to know about hydroponic gardening with Darlene Schacht. 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 to the public on Tuesdays at 9:30 a.m. On Tuesday, October 1, George Gries talks about Handling and Care of Native Desert Plants. Call (520) 648-0808 for information. TUCSON ORGANIC GARDENERS. 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.

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