California goldenrod (Solidago velutina ssp. Californica) is a perennial herb that produces masses of yellow flowers when many other plants are dormant, in late summer and fall. It grows fast and produces many flower spikes up to 5 feet tall.
Birds and pollinating insects love this plant. Throughout California it is found in open, grassy places up to an elevation of 7,500 feet.
This is a very garden tolerant, easy plant. It likes to be wet in winter/spring and dry in summer but can take extra water. Because it spreads from a creeping rootstock California goldenrod may become invasive; give it room.