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What are they, and how do they work? Take this short course to find out!
Learn about carbon's role in plant growth, and why it's such an important element for all living things.
Harrell’s EarthMAX is a unique soil additive designed to promote maximum soil and plant health in turf and ornamental programs.
Phytophthora is truly a plant destroyer. Learn how to prevent, identify and control this destructive disease.
With Dr. Jeff Higgins
Xylella can devastate plants. This course will get you up to speed on this disease.
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.
Learn about water quality and how it impacts plants and soil.
Learn about the five most economically destructive insects for southern turfgrass.
This course describes how soluble salts impact fertilizers and plants.
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.
The relationship between plant nutrition and disease is very complex
Spider mites come in a variety of shapes and sizes, but they all have one thing in common: they’re bad news for plants.
Learn about Magnesium and how it impacts plant health!
In this learning course, Lynn Griffith discusses the primary nutrient phosphorus and how it relates to horticulture.
Learn about how plants cope with high temperatures.
The following CEU-credited courses are available to myHarrell's customers.
Turf & Landscape
Take the weight off busy schedules and tight budgets. You’ll save time and money using our Early Order Programs.
Discusses Harrell's Core Values
on November 12 by Rick Helpingstine
in Horticulture, Tissue
A leaf analysis shows what nutrients are actually being absorbed by the plant, and in what quantities and ratios.
on November 7 by JJ Jansen
Now's the time to build root mass and bounce back from disease and insect damage.