Education Materials

Carbon in Soil and Plants

Learn about carbon's role in plant growth, and why it's such an important element for all living things.

Introducing Harrell's EarthMAX

Harrell’s EarthMAX is a unique soil additive designed to promote maximum soil and plant health in turf and ornamental programs.

Understanding Nitrogen

Learn about nitrogen's role as a major nutrient from plant and soil expert Lynn Griffith!

Phytophthora Course

Phytophthora is truly a plant destroyer. Learn how to prevent, identify and control this destructive disease.


Nematodes are unsegmented roundworms that live just about everywhere on Earth, but some varieties can cause problems for growers and turf managers.

Spider Mites

Spider mites come in a variety of shapes and sizes, but they all have one thing in common: they’re bad news for plants.

Managing Flea Beetles in the Nursery

In this course, Tropical Plant and Soil Expert Lynn Griffith takes a look at the damage caused by flea beetles, and explains what you can do to keep them away from your plants.

Understanding Pesticide Labels

What information is on a pesticide label, and why is it important?

Magnesium Nutrition in Plants

Learn about Magnesium and how it impacts plant health!

Phosphorus – A Horticulture Perspective

In this learning course, Lynn Griffith discusses the primary nutrient phosphorus and how it relates to horticulture.

How Plants Deal with Heat

Learn about how plants cope with high temperatures.

Plant Physiology for Growers, Part 1: How Plants "Think"

Plants aren't able to think the way we are, but that doesn't mean they're helpless.

Water Quality and Its Effect on Media

Learn about water quality and how it impacts plants and soil.

Introducing Harrell's MAX Cal Plus

Soil & Plant Tissue Testing

Learn Techniques for Taking Soil & Tissue Samples for Testing!

Rain Water vs. Irrigation Water

Ever noticed that plants respond better to rain water than to irrigation water?

EC Does it: Understanding Soluble Salts

This course describes how soluble salts impact fertilizers and plants.