What is the best spray to kill thistles?
Simply so, what is the best way to kill thistles?
Apply herbicides to kill thistle, especially in spring and fall, before thistles can flower and seed. Use glyphosate for your garden, and use a broad-leaf herbicide containing 2,4-D or MCPP for your lawn. Since glyphosate kills all plants, you must keep application specific.
Then, what is the best Thistle Killer?
The vinegar needs to contain at least 20 percent acetic acid to be effective at killing weeds. Filling a spray bottle with this type of vinegar plus 3 tablespoons of table salt makes an effective homemade thistle herbicide. Saturating the unwanted plants once a week with this mixture helps control the problem.
Spot spraying with an herbicide containing the active ingredient glyphosate most effectively kills milk thistle at the rosette stage, repeat as needed. Spot application means the herbicide is applied only to the Milk thistle plants, and not to the surrounding plants or soil.