Annual weeds complete the life cycle in less than one growing season.
Any practice that completely removes the shoot or dislodges the entire plant should result in complete kill. Chemicals with only soil activity effectively control annuals during germination but not after they become established. All herbicides with foliar activity as well as shallow tillage, hoeing and flaming should control these weeds after they emerge from the soil. Summer annuals germinate in spring and summer and then compete most in spring-planted crops before canopy closure or in perennial crops when canopies are open. Summer annual broadleaves include common cocklebur, common lambsquarters, common purslane, common ragweed, giant ragweed, pigweeds, jimsonweed, and velvetleaf.