Garden Calendar

* A class on the care of citrus trees with a tasting of winter fruit, Saturday, 10 a.m.-noon, at the Arboretum of Los Angeles County, 301 N. Baldwin Ave., Arcadia, (626) 821-3222. $12; for reservations, call (626) 821-4623.

* Seminar on roses for 2001 and beyond with hybridizer Tom Carruth and grower Syl Arena, Saturday, 10 a.m.-12:30 p.m., at Descanso Gardens, 418 Descanso Drive, La Canada Flintridge, (818) 952-4401; https://www.descanso.com. $25 fee includes two bare root roses. Reservations required.

* Baiko-En Kenkyukai Bonsai Society’s “Winter Silhouettes” show, Saturday and Sunday, 9 a.m.-4:30 p.m., at the Arboretum of Los Angeles County, 301 N. Baldwin Ave., Arcadia, (626) 821-3222. $5.

* Noted British rosarian and author Peter Beales will speak on old roses for modern gardens, Sunday, at 2:30 p.m., at the Huntington Library and Botanical Gardens, 1151 Oxford Road, San Marino, (626) 405-2141, https://www.huntington.org. $5, reservations requested; call (626) 405-2164.

* Talk on what the Orange County coastline looked like in the 19th century, by professor Wayne Engstrom, Sunday, 3 p.m., at the Fullerton Arboretum, Associated Road at Yorba Linda Blvd., Fullerton, (714) 278-3579. Free.

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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.