Garden Calendar

A walk to see the “The Great Trees of Descanso Gardens” with information on how to use them in the home landscape, Saturday, 10 a.m., at Descanso Gardens, 1418 Descanso Drive., La Canada Flintridge, (818) 952-4401; https://www.descanso.com. $5.

* A workshop on home composting, Saturday, 10-11 a.m., at the Fullerton Arboretum, Associated Road at Yorba Linda Boulevard, Fullerton, (714) 278-3579. $7.

* Put on that Hawaiian shirt for a hibiscus weekend with hikes to see hibiscus, hibiscus on sale and a seminar by Charles Black (Sunday at 12:30 p.m.) on the new wild hibiscus he has developed, Saturday and Sunday, 9 a.m.-5 p.m., at Descanso Gardens, 1418 Descanso Drive, La Canada Flintridge, (818) 952-4401; https://www.descanso.com. General admission: $5; seminar fee: $20, reservations required.

* A benefit tour of four gardens in Santa Monica and Brentwood sponsored by House & Garden magazine, Saturday, 11:30 a.m.-3:30 p.m. $75, call (800) 218-4248 for reservations. There is also a $225 private tour and luncheon with the garden editor, Charlotte Frieze. Proceeds benefit Westside Children’s Center Assistance League.

* A weekend symposium on Mediterranean gardens, with speakers from California and southern Europe (including Alessandra Vinciquerra, garden director of the American Academy in Rome) will discuss the opportunities and constraints of our special Mediterranean-type climate. Held at the Arboretum of Los Angeles County in Arcadia; Sept. 30 and Oct. 1; reservations required. Fee: $200. Call (626) 821-4624.

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