DEAR JESSICA: I have a pear tree that's about 55 years old and have noticed what looks like grass ... EMAILER: Green masses growing on tree trunks or branches could be lichens, moss or algae.

For instance, what are those green masses growing on your trees? Those growths could be either lichens, moss or algae ... which is to say they like to grow on trees that are already ailing ...

For instance, what are those green masses growing on your trees? Those growths could be either lichens, moss or algae ... which is to say they like to grow on trees that are already ailing ...

The substance ... tree. – Multnomah County A: This look like a crustose lichen, which is not a pathogenic problem. It’s nothing to worry about. Our environment is favorable for many moss ...

green moss she used to discover the city's hidden hot spots of toxic air pollution. "I mean, it's just everywhere," she said. "You can see it on all these trees here, across the street.

Question: During the winter, we noticed small tufts of gray-green moss on the limbs ... the life of lichens and moss is often short-lived as these trees and shrubs shed their bark to cleanse ...

Ball moss does not kill trees. But as the small gray-green tufts become dense, they can shade developing buds. A small amount of ball moss is not harmful to a healthy tree. A heavy infestation in ...

Lush green moss growing on trees and outcropping stones creates a beautiful natural look in a garden. It can be difficult, however to persuade moss to grow where you want. Relying on recipes that ...