GARDENING BASIC BOTANY. Tohono Chul Park. 7366 N. Paseo del Norte. Grounds curator Russ Buhrow provides the home gardener with a layman's understanding of plant physiology and taxonomy is Basic Botany for Gardeners, at 2 p.m. Tuesday, January 14, in the Wilson Room. Call 742-6455 for information or to reserve a space. 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.

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