J Collins, Toowoomba, Qld

Gardening Australia - - MAILBOX -

We were driv­ing past Boyce Gar­dens in Toowoomba on a rainy day, and saw this line of trees drip­ping in foam. The foam pud­dled on the ground and took some time to dis­solve. Can you ex­plain what causes this?

El­iz­a­beth Swane says

This is an in­ter­est­ing nat­u­ral phe­nom­e­non. When it rains, water run­ning down the trunk of the tree dis­solves chem­i­cals from the bark. A change in sur­face ten­sion oc­curs, air is in­tro­duced to the water and a foam is formed. This is sim­i­lar to the foam you some­times see in a creek or on the ocean shore, when phos­phates com­bine with water and air. A foam­ing tree, of­ten a eu­ca­lypt, af­ter rain is noth­ing to worry about. En­joy na­ture at work!

Newspapers in English

Newspapers from Australia

© PressReader. All rights reserved.