GARDENING PLANT SALE. The Los Cerros Garden Club holds its seventh annual plant sale from 10 a.m. to 6 p.m. Saturday, March 23, and 11 a.m. to 4 p.m. Sunday, March 24, at Foothills Mall, 7401 N. La Cholla Blvd. Sale features herbs, vegetables, cacti, succulents, hanging baskets and other flowering plants. Proceeds benefits local horticulture and conservation groups. Call 297-6220 for information. ARID PLANTS SALE. TBG holds its annual Spring plant sale from 10 a.m. to 4 p.m. Saturday, March 23, and from noon to 4 p.m. Sunday, March 24, at 2150 N. Alvernon Way. The sale features a variety of arid landscaping plants including trees, flowering perennials, cacti and succulents, wildflowers and herbs. Call 326-9255 for information. CONTAINER GARDEN CONTEST. Tohono Chul Park, 7366 N. Paseo del Norte, seeks entries for its Container Garden Design Competition during the Wildflower Festival, April 13 and 14. Competition features both commercial and individual divisions with three categories: one gallon and under, one to five gallons, and up to 24" diameter pot. Gardens will be judged on April 13 and sold in silent auction April 14. Entry forms may be obtained by calling Prindle Gorman-Oomens at Tohono Chul Park at 742-6455. Deadline for "intent to enter" forms is March 29. PLANT OF THE MONTH. The Arizona Nursery Association and Arizona Municipal Water Users Association have started a plant of the month program in order to meet the demand for more water-efficient plants. The March plant of the month is Justicia. Visit your local participating nursery and ask for your free Plant of the Month brochure. 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. Regular attractions include the following: 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; plant clinics; 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. GARDEN DEMONSTRATIONS. The following free, one-hour demonstrations are offered at 9 a.m. Wednesdays at the Extension Garden Center, 4210 N. Campbell Ave.; and at 1 p.m. Wednesdays at the Wilmot Library, 530 N. Wilmot Road: March 27, Maintenance on Irrigation Systems. Call 628-5628 for information.

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