Susan Luzzaro 9 p.m., Aug. 20
The Silk Oak Tree
The silk oak tree, a fast-growing import from Australia, comes into short-lived glory this month. Golden flower clusters decorate the silvery-green branches, an effect that is particularly stunning when seen in contrast to the blue-blossoming jacaranda trees often planted nearby. A common tree in San Diego-area parks, the silk oak is also a popular street and back-yard tree in the older residential areas.