There an error on the page that gives the formula for a borax solution to...
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.
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 https://web.extension.illinois.edu/cfiv/homeowners/060601.html and http://hyg.ipm.illinois.edu/pastpest/200114e.html 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.
It looks like the page in question is not on your site:
However, I found the link to it here: https://ask.extension.org/questions/183784#.U5csFChGm8U
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: http://www.ehow.com/how_6208940_kill-weeded-creeping-charlie-borax.html
County Extension Director - Fort Bend Co., TX