Random Garden Tip:
Do Not Waste Ashes
When you have ashes remaining (especially from your wood stove) do not eliminate them or neglect them! You would most likely never ever consider this, but ashes work wonders in your garden.
And it is very herbicide-resistant, if you use the wrong formulation of herbicide. The only way to remove knotweed is either using a glyphosate product or an imazapyr product. Those are two different active ingredients. And imazapyr, I generally do not recommend because it translocates. Glyphosate, according to our federal government, does not translocate. So, in a knotweed situation, you really have to use that herbicide in order to gain effective control at the right time of the year.
Margaret: So, do you wait till it’s close to flowering and cut it down first and then paint what’s left, what’s the timing here?
Christian: There’s three options. One is you could cut down the plants in June. By June, the knotweed stalks, they grow like asparagus in May, and then by June, they’ll be about 3 feet high. You could cut them down in May, if you’re not near a water body, or transportation of the stalks is not likely. Because if one of those stalks, up to a quarter-inch in length, gets anywhere else, it will create a new knotweed infestation.