Crabgrass Identification Pictures: University of Michigan Seedling Guide

University of Michigan weed science has seedling photos. Mature weed pictures at Walter Reeves' "Weeds – Identification with Pictures" page.

Good visual references for ID.

About Gardening: Weed Control in a Rock Garden: Beyond Landscape Fabric; Eradicating Bishop’s Weed (Ground Elder) from the Garden; Identifying and Controlling Pigweed in a New Ryegrass Lawn; Oxalis: The Seed-Shooting Weed Taking Over Virginia Beds; Identifying and Controlling a Grassy Weed in Garden Beds; Weed-and-Feed Accidentally Applied to Garden: Damage Control; Managing Dichondra in Shady St. Augustine: Consider Alternatives; Herbicide Residue After Ivy Removal: Test with Radishes Before Planting Vegetables; Mulberry Weed Control: Pre-Emergent and Post-Emergent Strategies; Weed Identification and Control: Picture Guides, Resources, and Strategies

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