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 admission to the gardens is $4, $3 for seniors, and free for members and children under 12. Call 326-9255 for information. 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 which fertilizers are recommended for gardens and landscapes on April 23. These free demonstrations are held in the open and last about one hour. Call 626-5161 for information.

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