Skip to main content

Common Ragweed

Ambrosia artemisiifolia L.


Family: Asteraceae

Habit: summer annual


Ecology

Management:

Because common ragweed seedlings are fragile, stirring of the top 1-2 inches (2.5 to 5 cm) of soil 2 to 4 times within the first month following tillage is effective at removing most of the individuals that will emerge during the season (Weed early & shallow). Because it emerges primarily early in the season, reworking the seedbed one or two times before planting a crop (Stale seedbed) is often practical. Thus, rotation of early season crops in which the weed is difficult to control with summer crops in which such stale seedbed practices are practical is an effective long term strategy for managing the weed. Organic mulch is less effective for suppressing common ragweed than for other annual weeds, but can still be useful if applied in especially heavy layers.

Because the seeds are so persistent in the soil, removal of escapes from the garden before they set seeds is critical for long-term control.

Useful Management Techniques