Health Canada licensing regulations require that all volunteer hemp plants growing the next year must to be eliminated. There are a wide range of broadleaf herbicides registered in cereal and oilseed crops that will control volunteer hemp in crop. A spring cultivation or herbicide burn off with Glyphosate is generally effective with minimal volunteer plants to control in crop.

Volunteer Hemp in Wheat

Volunteer Hemp in Barley

The year following a hemp crop consideration must be given to the crop and herbicide so that the volunteer hemp can be controlled.  For example, contact herbicides like Liberty are effective on volunteer hemp in its early stage (less than 5 cm (2 inches)). As hemp gets older, the herbicide will be less effect on volunteer hemp and may only cause leaf burn, allowing the plant to recover from any viable node.