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Herbicides for Daylilies


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  • The showy, colorful daylilies that liven up your home garden with their vivid warm colors are under the threat of weed invasion. When broadleaf weeds or annual grasses crop up amidst your prized daylilies, they often compete for nutrients and attract pests that cause further damage to your flowers. Apply herbicides as a chemical management method to keep weeds at bay and your daylilies vigorous.

Trifluralin

  • Trifluralin is utilized for daylilies as a preemergence weed management resource applied before weeds emerge from soil. This herbicide is also selective, as opposed to non-selective, according to the Cornell University Cooperative Extension. Selective herbicides are formulated for activity on particular plants while they leave other unharmed. This type of herbicide is ideal for use on expansive areas where you wish to eradicate a widespread weed infestation without injuring desired plants. For use on daylilies, a granular form is appropriate and should be applied to the surface of the soil. If weeds are already present, remove them by hand before applying trifluralin. At a rate of 1 ounce per every 10 square feet, this herbicide controls broadleaf weeds and annual grasses. Irrigate with 1/2 inch of water after applying to incorporate granules into soil, according to the University of Tennessee.

Glyphosate

  • Glyphosate is a postemergence herbicide applied to weeds once they have emerged from soil and are in an active growth state. Glyphosate is a non-selective herbicide that kills all plant matter with which it comes into contact. It is important to practice extreme care during application to avoid damaging desired plants like your daylilies. Glyphosate is most useful as a spot treatment for small or scattered weed problems where the herbicide is sprayed directly onto foliage for control of broadleaf weeds and grasses as well as nearly any annual or perennial plant, according to the Cornell University Cooperative Extension. This herbicide functions through foliar absorption as it then circulates throughout the plant; allow one to two weeks for visible results, explains the University of Tennessee.

Sethoxydim

  • Sethoxydim is a postemergence herbicide that controls annual and perennial grasses that have already emerged from the soil and are actively growing. This herbicide is selective and appropriate as a foliar spray on daylilies. Apply at a rate of 1.4 ounces per each gallon of water, according to the Cornell University Cooperative Extension. Subsequent applications are necessary if regrowth appears.

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