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Tree Biology

The Basic Anatomy of a Tree

The Basic Anatomy of a Tree
We know what a tree is – but there is no precise definition which is completely recognized of what a tree is in ordinary language or in botany. 

In the broadest viewpoint, a tree is any plant formed with an...

Is it Time for a House Call? (Part 1)

Is it Time for a House Call?

Spring is a great time to consider San Francisco tree and shrub pruning service before the warm weather rush begins. 

Protecting your Trees from Common Spring Diseases

Tree diseases and pests can make an...

A Sucker is Born . . . .

A Sucker is Born...

Epicormic sprouts, also known as "suckers" or "water sprouts," are a growth that appears from dormant buds on an existing tree branch or trunk. 

A tree of nearly any size can break out heavily in epicormic sprouts....

Armillaria Root Rot – Its Bark Glows in the Dark!


With so much media attention focused on our environment, most people are somewhat familiar with pests and diseases that can have a devastating effect on specific trees such as the Emerald Ash Borer and sooty canker. 

However, there is a...

The Arborist Now Tree Quiz


Are you interested in testing your tree-teligence? Take our tree-knowledge quiz below and see how you do! 

Each question is multiple choice; scroll down for the answers. We designed this quiz for laypersons, but we have published a quiz...

Thorns and Prickles and Spines, Oh My!


While not terribly common, many trees bear sharp thorns along their twigs, branches or trunks. Often, thorns are seen as problematic traits, and trees that bear them are often avoided during installations. Some have even produced thornless...

Tree Bark: That Beneficial Barrier


Tree bark is roughly akin to the skin of animals; it helps to define the boundary between the internal and external world, and it provides protection against a variety of threats. While bark fails to attract the same level of attention that...

Mycorrhizae: My Favorite Kind of Fungi


The more ecologists learn about the world, the more it becomes apparent that all living things are connected. Trees provide numerous examples of this, as even youngsters understand that trees provide animals with fruit, shelter and other...