The grey patches are likely lichen, a combination of a fungus and an algae. It is harmless to you and the tree. It is common ...

More than 500 native plants in San Diego County are held in a Native Seed Bank at the zoo. Those seeds are dried down to a ...

The United States is trying to curb unfair and abusive Chinese trade practices, which have been exacerbated since Beijing's ...

You can also help by learning the symptoms of rapid ʻōhiʻa death — sudden browning, wilting and dieback — as well as ...