Visit 19 private and public native gardens in San Diego and Poway, with stops spanning North Park and Clairemont to Rancho Peñasquitos and Carmel Valley. Docents will share information on plantings and conservation efforts like lawn replacement and gray water systems. $25; kids are free. 9:30 a. to 4:30 p..m. both ticket days. Attendees with receive a booklet for self-guided tours; register by March 19 to receive it in the mail or go to Walter Andersen’s nursery in Poway or Point Loma or at Southwestern College’s SBBG.