GARDEN CALENDAR.

A nine-week Community Garden Project to grow organic vegetables and flowers will feature horticulturist Richard Blaisdell giving instruction in environmentally friendly year-round gardening, 2 to 4 p.m. Tuesdays beginning July 2, Hughes Adult Learning Center's horticulture center, Burbank Boulevard between Shoup and Fallbrook avenues, Woodland Hills. Plot assignments will be made the first week, and gardening hours will be arranged for each student's convenience. Fee: $40. Registration takes place at El Camino Real High School Adult School office, 5440 Valley Circle Blvd., Woodland Hills. For more information, call [phone].

National Cactus and Succulent Show and Sale by the Cactus and Succulent Society of America will present more than 1,500 award-winning plants, including many rare and unusual plants from around the world, 10:30 a.m. to 4:30 p.m. July 6 and 7 (preview sale, 1 to 4:30 p.m. July 5), Huntington Library, Art Collections and Botanical Gardens, 1151 Oxford Road, San Marino. Admission: $7.50 adults; $6 for seniors, and $4 for children and students. Visitors also are invited to explore the Huntington's own 12-acre Desert Garden, where more than 5,000 different species of cacti and succulents provide a year-round show of their own. [phone].