There an error on the page that gives the formula for a borax solution to...

Asked May 26, 2014, 12:21 PM EDT

There an error on the page that gives the formula for a borax solution to kill creeping charlie. It says to dissolve 10 oz. of borax in 4 oz. (1/2 cup) of warm water. Since the solubility of borax in water at room temperature is about 5% by weight, the above will at best produce a thick slurry. Although 2.5 gallons of cold water is enough to complete the solution, it's unlikely to do so quickly, leaving much of the borax at the bottom of the tank. This will at best yield inconsistent and at worst inadequate results. This may explain the inconsistent results reported by several readers. A minimum of 1.25 gallons of warm water is needed to ensure quick dissolving. A note should be added to keep stirring until the borax is completely dissolved.

Outside United States

3 Responses

Could you please identify the eXtension page you found this information? Two Illinois Extension publications notes the issues with using Borax for weed management due to inconsistent results and The points you bring out about cold water and the need for agitation are valid, but may have been discussed in the Iowa research cited in the two references above. Thank you. We will be looking for your response.

I am unaware of this method of control for Creeping Charlie. I personally would think the application of a micro-nutrient to control a weed would pose toxicity issues later on.

Having said that, the same info appeared at this site:

Vincent Mannino
County Extension Director - Fort Bend Co., TX