Learn to identify and control aphids
Note: CEU credit is available for this course in some states. Please refer to the information on the CEU Credit Information tab, above, for details.
In this course,...
Learn how Bicarbonates affect soil and plant health
Learn more about Bio-MAX 4-0-0 and test your knowledge!
Welcome to the Bio-Max 7-7-7 Course!
This course will introduce you to Harrell's Bio-Max 7-7-7, a powerful biostimulant that increases stress tolerance, photosynthesis and root development.
Welcome to the Bio-Max Root Enhancer Course!
This course will introduce you to Harrell's Bio-Max Root Enhancer, a powerful biostimulant and micronutrient load for any foliar program.
Learn about boron's function in plants, and how to check for (and correct) deficiency and toxicity situations.
Learn about the basic agronomic benefits of Calcium
Learn about carbon's role in plant growth, and why it's such an important element for all living things.
The following CEU-credited courses are available to myHarrell's customers.
This course will teach you the basic agronomic benefits of the minor elements Copper, Zinc and Boron.
This course covers common nutrient deficiencies in plants.
This course includes a visual guide for identifying nutritional deficiencies of ornamental plants
Welcome to the Downy Mildew on Ornamentals course!
This course will teach you to identify Downy Mildew, and offers advice on prevention.
This course describes how soluble salts impact fertilizers and plants.