Search for a suitable alternative is underway. Weeds Weeds are a continuous production problem in sunflowers. Weed control practices on sunflowers in North Dakota are accomplished through the use of herbicides, tillage, and rotation. Weeds management is one of the greatest concerns of growers during the first four weeks of growth. Weed control at this time is essential to maximize returns from sunflowers.
Foxtails are late spring emerging weeds.
Foxtail plants can be numerous in a sunflower field, but can easily be controlled with most herbicides. Wild mustard can continue to emerge with timely rains and continues to be a problem throughout the season. Herbicides used in rotations with other crops are the best means for control in sunflower fields. No chemical selectively controls Canada thistle in sunflower. However, glyphosate is registered for preemergence use and use with shielded sprayer between sunflower rows.