The 20th Annual Southern California Spring Garden Show returns to South Coast Plaza April 23-26. Themed Celebrating 20 Years of Gardens, the four-day event will feature designs from the past two decades, celebrate trends from the past and present, and look at new garden designs for the future. Guests are invited to view display gardens created by landscape architects and university horticulture students, browse and shop specialty garden lifestyle vendors, and attend seminars given by nationally renowned experts. Children can take part in complimentary arts and crafts, and enjoy live animal shows and storytelling. The center rotunda will feature an impressive floral centerpiece designed by Fiesta Floats of Pasadena. Parking and admission are free. (714/435-2160, www.springgardenshow.com)   JANE SHIOMI