The oak is often a symbol of solidity and permanence, but the secret of the tree’s success may be in its ability to adapt and ...

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 latest tree pollen count is 847 with Pine, Mulberry and Oak the predominant species. In addition to tree pollen, grass pollen season is ramping up. We first saw grass pollen show up in mid-May ...

The main culprits for spring hay fever are tree pollens , particularly from birch, alder, hazel, and oak . "Tree pollen tends to spike during warm, dry days with light winds," Sarah says.