Edward writes
2,4-D compounds are systemic herbicides and will translocate slowly down to the roots. Helena Crossbow containing the 2, 4-D active ingredient would work with the same mode of action however St. Johnswort (goat weed) is not listed on the product label as one of the weeds it will control therefore we cannot advise on the efficacy it would have on the weed.
Some alternative options that are labeled for St. Johnswort (goat weed) would be Bonide Poison Ivy and Brush Killer BK-32 Concentrate (Dicamba and Triclopyr) , Chaparral Herbicide (Metsulfuron methyl) or Alligare 2,4-D Amine Herbicide( 2,4-D). Also using a non selective glyphosate product such as RoundUp is commonly used to spot treat harder to kill weeds.
Review the product labels for application rates and information on Tank Mixing Herbicides if allowed for better results.
St. Johnswort is best treated by spot spraying when it is in flower (Nov–Jan) because it can be easily seen then and is at its most sensitive period to herbicides. Spraying should begin six to eight weeks after substantial rain and when St John’s wort reaches the 50% yellow bud – 50% open flower stage.
Answer last updated on: 03/04/2024
