GARDENING BEAT THE HEAT. Tucson Open University. 2030 E. Broadway. 622-0170. Learn to plant and maintain a beautiful organic vegetable garden, even in the severe Tucson heat. Esther Moore, experienced desert gardener, offers a workshop from 9 a.m. to 2 p.m. Saturday, August 3. Cost is $39. Call Phill Miles at 622-0170 to register. BOTANICAL GARDENS. Summer hours at the Tucson Botanical Gardens, 2150 N. Alvernon Way, are 7:30 a.m. to 4:30 p.m. daily. The TBG nursery is closed until October. 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. Admission is $3, $2 for seniors, and free for children under 12. Call 326-9255 for information. The Gardens need docents! Anyone interested in volunteering is encouraged to apply for the 10 week course which begins on Friday morning, September 27. Call 326-9686 for information.

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