Education Materials

Plant Growth Regulators

What are they, and how do they work? Take this short course to find out!

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.

Maximizing Fertilizer Efficiency for the Lawncare Market

With Dr. Jeff Higgins

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.

Insect Control in Southern Turfgrass

Learn about the five most economically destructive insects for southern turfgrass.

Phytophthora Course

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

Xylella Leaf Scorch

Xylella can devastate plants. This course will get you up to speed on this disease.

Water Quality and Its Effect on Media

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

EC Does it: Understanding Soluble Salts

This course describes how soluble salts impact fertilizers and plants.

Whitefly Management

Learn how to control these destructive pests.


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

How Plant Nutrition Affects Disease

The relationship between plant nutrition and disease is very complex

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.

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.

Introducing Harrell's MAX Cal Plus