California lilacs, also known as Ceanothus L., come from the Rhamnaceae family. More than fifty species of lilac can be found in California alone. Most species of this family are native to North America, with California being the central location of the majority of the flowers. Some can also be found in southeast Canada, the eastern part of the United States, the Rocky Mountains, and as far south as Guatemala.

Some species are tall and tree-like, with the majority of them being evergreen. Very few varieties are deciduous and can adapt to cold winter climates. The plant’s small, serrated leaves are arranged in opposite patterns and feature three very visible veins running from bottom to top of each leaf. The top part of each leaf is also shiny with a gummy-like texture.

Lilac flowers range from white to pink to blue to pale purple, while the tree’s roots are red inside. The tiny flowers produce an intensely sweet smell and are formed in big, cluttered clusters.

The lilac can grow p to seven meters in height and prefer to grow in rocky soils that are well-drained. Their sun preference is in southern slopes, and they can live up to ten to fifteen years. Their location, of course, often shortens the lifespan due to wildfires.

That said, it does have its own self-reliant properties. When near fungi, lilacs can obtain their own nitrogen. Gardeners recommend not fertilizing lilac plants, as the plants do not require it and fertilization will only serve to kill off any helpful fungi in the area and make room for parasitic fungus instead. This important symbiotic relationship also helps foster the growth of other nearby plants by providing much-needed nitrogen. The fires also serve the plant by releasing dormant seeds in the ground, which is largely the route of propagation for the plant.

When growing California lilacs, it’s important to remember to limit their watering. They will rot and die with regular watering or being planted in heavy soils; lighter soils and very light watering are highly recommended. For this reason, the plants should not be mulched, either. To avoid these problems, it is also advisable to plant the flowers higher than the rest of the plants, perhaps on easily-draining sloped areas, in a garden to avoid overwatering. Arranging a drip form of irrigation can also prevent root rotting.

The plants are typically used for ornamental purposes, though some Native American tribes utilized the red root in medicinal use.