PHC learning center

Plant Health Care,
but explained for trees.

Tidbits of knowledge for tree folks. A little science and a lot of practical.

Arborist examining leaf symptoms and tree bark
01

Keep it simple

PHC 101 for regular tree folks

A simple field guide to the four main Plant Health Care treatment categories and how to narrow down a diagnosis.

7 minute readRead article
Fine tree roots growing through healthy structured soil
02

Roots before shoots

Tree health starts below ground

Why canopy symptoms often start with stressed roots, and why lasting PHC plans treat both the pest and the tree's health.

5 minute readRead article
Tree health treatment products and measuring equipment beside a mature tree
03

Not the same thing

Fertilizer vs. soil amendment

A plain-English comparison of fertilizers and soil amendments, what they do, and when trees may benefit from each.

6 minute readRead article
Arborist holding porous horticultural biochar near a tree root zone
04

Tiny pores, big job

What is biochar, and why use it around trees?

What biochar is, what it can do in tree soils, and why it works best as part of a complete soil-health plan.

5 minute readRead article
Arborist using soil injection equipment beside a mature tree
05

Two ways to go below

Soil drench vs. soil injection

How soil drenches and soil injections differ, what equipment they need, and when each application method makes sense.

6 minute readRead article

One useful article a month.

Built around the questions tree people actually ask in the field.

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