* A talk on wild species roses and their impact on breeding, Saturday, 10 a.m., at Descanso Gardens, 1418 Descanso Drive, La Canada Flintridge, (818) 952-4401; http://www.descanso.com. $5.
* A show and sale by the Los Angeles Cactus and Succulent Society and San Fernando Valley Bromeliad Society, Saturday, 9 a.m.-5 p.m., and Sunday, 9 a.m.-4 p.m., at the Sepulveda Garden Center, 16633 Magnolia Blvd., Encino, (818) 367-0864. Free admission.
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.