Courtesy of Wally S., Wally's Urban Market Garden, Saskatoon SK
Perennial weeds come in all shapes and sizes. Some are more controllable than others. In sub-segment size areas under 500 sq. ft. you can take try the Terminator approach to eradicate them completely to keep the plot in production.
Larger areas take more finesse because it is harder to know what you are dealing with. For instance, I've worked plots for years without any sign of weeds, and then one season they just start showing up. Many SPIN farmers are presented with offers for larger size plots, in the 1/4 to half-acre range, that are too good to refuse. They clean them up so they look like a field of dreams and then bindweed starts sprouting everywhere. In these situations eradication will take time and effort you don't have, and it might not even be possible.
Instead, fight one aggressive plant with another. If you put in widely spaced crops that grow relatively quickly, such as winter squash, they can duke it out with the weed once they start vining out. In essence they are acting as a weed suppressant in their own right.
Potatoes are also a good option, since once you hill them, you can easily aggressively weed around them. Green beans and broad beans are other options and are ones I will be using this year in a perennial grass problem area.
So when it comes to weeds know there is another approach besides hasta la vista. Instead use appropriate crop selection and technique to win your battle with weeds.
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