Thats silly, its not orange juice & profit margins. Chemical is watered down to a specific ratio to be effective, selective & safe(r).
Many factors including temp, time, saturation, surfactant & subsequent watering all play an important roll in the effectiveness of a herbicide.
Basic rules of the trade: Apply in the early morning on a clear day 3 or more days prior to mowing, do not water for 2 days, do not apply when temps are expected to be above 90 & do apply to all surfaces of the foliage if possible & just to the point of run off. If you've followed all of these general guidelines & your weeds persist or fail to show any signs of curling/attrition there could be another reason...
Offhand, I don't remember if ortho wbg is a triamine base herbicide. If so & because of it prevalence for homeowner use, your Dandies may have built up an immunity to the salts. You'll need to try a different chemical base & follow the above guidelines.
To prevent future germination you may also try a pre emergent such as 'Preen' though you should keep in mind it will retard the growth of all seed, including lawn varieties if you have plans to overseed. Side note: your wbg has a reduced but similar affect on the surrounding soil for a short time after application.
If you have any other questions you're welcome to pm.
Everything is a weed unless you want it.



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