Garden Calendar

* Daylong program on “Oaks in Urban Landscapes,” today, 7:30 a.m.-4:30 p.m., at the Arboretum of Los Angeles County, 301 N. Baldwin Ave., Arcadia, (626) 821-3222. $75.

* A fall festival with native seeds and plants for sale with free talks each day, Friday though Sunday, 8:30 a.m.-4:30 p.m., at the Theodore Payne Foundation, 10459 Tuxford St., Sun Valley, (818) 768-1802.

* A sale of perennial plants including fall-bloomers, Saturday and Sunday, 10 a.m.-3 p.m., at the UC Irvine Arboretum, Campus Drive and Jamboree Road, Irvine, (949) 824-5833. $2.

* The San Gabriel Valley Cactus & Succulent Society

(https://www.desertsong.com/sgvcss) winter show and sale, Saturday and Sunday, 9 a.m.-5 p.m., at the Arboretum of Los Angeles County, 301 N. Baldwin Ave., Arcadia, (626) 821-3222. $5.

* The Los Angeles Rose Society show, Saturday, 1:30-4 p.m.; Sunday, 10 a.m.-4 p.m., at Descanso Gardens, 1418 Descanso Drive, La Canada Flintridge, (818) 952-4401;

https://www.descanso.com. $5.

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Send garden announcements to Garden Events, Los Angeles Times, 202 W. 1st Street, Los Angeles, CA 90012, at least three weeks before the event date.