Check low spots for patches. Scout fields early as the weed is most sensitive to herbicides in early stages. Effects on Crop Quality Hemp-nettle seeds are difficult to clean from grain. Control Tips Sow clean, certified seed to prevent its accidental spread. Early sown, uniform stands of competitive crops such as wheat, barley and canola are effective at suppressing hemp nettle.
Herbicides are available in cereal crops, canola and peas.
Flax and certain special crops are limited in terms of herbicide options.