What is the most effective stump killer?

The most effective stump killers typically contain glyphosate or triclopyr as their active ingredients. Glyphosate is a systemic herbicide that penetrates the plant and kills the roots, while triclopyr is specifically designed to target woody plants and is often more effective on tougher stumps. To achieve the best results, it's important to apply the stump killer shortly after cutting the tree, ensuring that you follow the manufacturer's instructions for application and safety precautions.