Garden Calendar

* The 20th annual Fascination of Orchids International Show and Sale opens a four-day run today. Hours are 10 a.m. to 9 p.m. today and Friday, 10 a.m. to 7 p.m. Saturday, and 11 a.m. to 6:30 p.m. Sunday, at South Coast Plaza, 3333 Bear St., Costa Mesa, (714) 435-2160. There will be more than 20 talks during the four-day event. For a complete list, see https://www.ocorchidshow.com. Free.

* Friday, how to make chocolate leaves using camellia leaves and other teatime tips, 11:30 a.m., at Descanso Gardens, 1418 Descanso Drive, La Can~ada Flintridge, (818) 952-4401 (https://www.descanso.com). $28 with reservations required.

* Saturday, a class on starting seeds for the spring garden, 10 a.m., at the Fullerton Arboretum, Associated Road at Yorba Linda Boulevard, Fullerton, (714) 278-3579. $7.

* Saturday, a talk on camellia care by curator Tim Thibault, 10 a.m., at Descanso Gardens, 1418 Descanso Drive, La Can~ada Flintridge, (818) 952-4401 (https://www.descanso.com). $5.

* Saturday and Sunday, a class on the care and maintenance of native plants, 9 a.m. to noon both days, at the Rancho Santa Ana Botanic Garden, 1500 N. College Ave., Claremont, (909) 626-1917 (https://www.rsabg.org). $61 with preregistration required.

* Wednesday, a class on indoor plants, 9:30 a.m., at Sherman Gardens, 2647 East Coast Highway, Corona del Mar, (949) 673-2261. $20 with preregistration required.