Identify Common Garden Weeds: Annual vs Perennial

Annual weeds (spread by seed, die each year)

• Summer annuals — sprout in spring, thrive in summer/early fall (e.g. crabgrass, goosegrass, purslane, foxtail, lambsquarters).
• Winter annuals — sprout in fall, grow over winter, die late spring/early summer.
• Easiest to control: they spread only by seed, so preventing seed-set breaks the cycle.

Perennial weeds (regrow from roots)

• Examples: dandelion (deep taproot), quackgrass (creeping rhizomes), Canada thistle, plantain, pokeweed, field bindweed.
• Spread by seed AND by creeping stems or spreading roots.
• Hardest to control — great reproductive potential and persistence.

→ For photo ID keyed to your region, most state Extension services publish weed-identification fact sheets and image galleries.

Sources

Reviewed 2026-07-18. We cite university Extension, government, and established horticultural sources — and never invent pesticide rates or dangerous treatments.

• Iowa State University Extension — Types of Weeds in Landscapes, Gardens, and Lawns — Annuals complete their life cycle in one season and spread by seed; summer vs winter annuals; perennials regrow from roots and are hardest to control; example species.
• University of Minnesota Extension — Weed identification — Distinguishing annual grasses from perennial weeds by life cycle and spread; dandelion and quackgrass as perennials.

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