Some pine trees foam in hard rain because the chemicals in their sap are soap-like. : r/mildlyinteresting

What's That Foam on Trees?

Foaming Pine Trees & Heavy Rainfall on Christmas Day

Foaming Pine Trees & Heavy Rainfall on Christmas Day

Foaming Pine Trees & Heavy Rainfall on Christmas Day

Foaming Pine Trees & Heavy Rainfall on Christmas Day

Foaming Pine Trees & Heavy Rainfall on Christmas Day

The Vineyard Gazette - Martha's Vineyard News

Foaming Pine Trees & Heavy Rainfall on Christmas Day

Foaming Pine Trees & Heavy Rainfall on Christmas Day

Is Resin Bad For The Environment? (Answered) - Conserve Energy Future

Foaming Pine Trees & Heavy Rainfall on Christmas Day