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• Weeds are classified as grassy (such as crabgrass), broadleaf (such as dandelions and plantain), annual or perennial.
• Weed seeds can lie dormant in the ground for several years, then grow again when conditions are right.
• Spring is the best time to control broadleaf and grassy weeds when they are small and vulnerable. Weed killers are formulated to work best in temperatures between 60°F and 85°F.
• Pre-emergent herbicides attack weeds before they break the surface of the soil. Apply them early in the spring. Post-emergent herbicides attack the plant after it begins to grow.
• Selective herbicides kill certain plants but do not harm others. Non-selective herbicides will kill all vegetation they touch.
• Do not rake or dethatch lawns after applying a pre-emergent herbicide. It will destroy the protective barrier the chemical has created.