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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.
Learn how to control these destructive pests.
Xylella can devastate plants. This course will get you up to speed on this 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 come in a variety of shapes and sizes, but they all have one thing in common: they’re bad news for plants.
With Dr. Jeff Higgins
Phytophthora is truly a plant destroyer. Learn how to prevent, identify and control this destructive 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 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.
Learn about water quality and how it impacts plants and soil.
This course describes how soluble salts impact fertilizers and plants.
Learn Techniques for Taking Soil & Tissue Samples for Testing!
The following CEU-credited courses are available to myHarrell's customers.
Learn how Bicarbonates affect soil and plant health
Learn about boron's function in plants, and how to check for (and correct) deficiency and toxicity situations.
Turf & Landscape
See how it works
Discusses Harrell's Core Values
on April 18 by Waldo Terrell
in Disease, Golf, Sports Turf, Turf & Landscape
It sure looks like winter injury to warm season turf will be a problem this year.
on April 4 by Harrell's
in Horticulture, Specialty Agriculture
Plants know when spring has arrived. Unfortunately, so do insects.