Is Johnson grass poisonous to cattle?
Got some seed from for my canaries and thought about planting some in my garden but I don't want it to spread to the paddocks if it is poisonous to cattle.
Certified GKH Gardening Expert
Johnson grass can be toxic to our livestock, but only under certain conditions. It produces a toxin, prussic acid, when it is under stress (such as drought, freezing weather). More information can be found here: