> They far exceed our short little maybe 80-90 year span on this earth. I mean we're so temporary. But the trees, these ancient trees, they cannot be taken for granted. Because you cannot replace an old growth forest.
>
> Once it's gone it's gone for good.
[Arborist Blair Glenn](https://youtu.be/epI3N53_Bw0?t=398)
---
The following applies to the Los Angeles area of Southern California.
## Natives
- [Quercus agrifolia](https://en.wikipedia.org/wiki/Quercus_agrifolia), California Live Oak, Coast Live Oak
- [Quercus engelmannii](https://en.wikipedia.org/wiki/Quercus_engelmannii), Engelmann Oak, Pasadena Oak
- [Juglans californica](https://en.wikipedia.org/wiki/Juglans_californica), California Walnut,
Southern California Black Walnut
- [Washingtonia filifera](https://en.wikipedia.org/wiki/Washingtonia_filifera), California Fan Palm
### Non-Natives
- [Cedrus deodara](https://en.wikipedia.org/wiki/Cedrus_deodara), Himalayan cedar, Deodar cedar
- [Pinus pinea](https://en.wikipedia.org/wiki/Stone_pine), Italian Stone Pine, Mediterranean stone pine, umbrella pine, parasol pine
### Invasives
- [Ailanthus altissima](https://en.wikipedia.org/wiki/Ailanthus_altissima), Tree of Heaven, Chinese sumac
- [Schinus terebinthifolius](https://en.wikipedia.org/wiki/Schinus_terebinthifolia), Brazilian Pepper Tree
- [Ulmus parvifolia](https://en.wikipedia.org/wiki/Ulmus_parvifolia), Chinese Elm
- [Washingtonia robusta](https://en.wikipedia.org/wiki/Washingtonia_robusta), Mexican Fan Palm
- Eucalyptus spp.
### Understory shrubs
- [Heteromeles arbutifolia](https://en.wikipedia.org/wiki/Heteromeles), Toyon, Christmas Berry, California Holly
