The best time to plant in L.A. is the fall and winter, particularly if planting drought tolerant California natives. Other drought tolerant plants establish better if planted in the fall too.

It depends on where she lives in Los Angeles. The weather and soil conditions can change drastically in a short distance. If she lives close to the coast, she can plant almost year-round. If she lives in the inland valleys, then she should probably wait until fall.

She can try contacting the Theodore Payne organization. They promote native plants in the Los Angeles area and have a very good selection. Moreover, they are very knowledgeable about local conditions. They are located in Sun Valley, which is near Glendale.

Here is a link that might be useful: Theodore Payne

GO to the LA Arboretum and the Huntington Library Gardens

check out the demonstration gardens for ideas and the Australian and mediterrean areas.. why limit yourself to CA natives? ....

it's amazing what grows there .. from palms to redwoods !