Weedkillers work by destroying or blocking the water passages in plant leaves, stems or roots, so preventing growth and eradicating the weeds. Chemicals are best combined with other control methods and should always be used with great care and strictly according to the instructions on the packaging. Keep them out of reach of children and animals, wear gloves and wash your hands after use. Apply in spring or summer for best results. Avoid applying on windy days.
Rain can ruin the effect of many weedkillers.
Always identify the weed type before attempting to control it so the correct chemical is used. For borders, use a paint-on gel formulation, applied to weeds that are growing where hand weeding or spraying is difficult without damaging nearby plants. Use a liquid weedkiller on paths, patios and drives.