All weeds can be controlled without weedkillers, but persistent or deep rooted weeds may be very difficult to eradicate. Ongoing control is likely to be necessary. Annual weeds (which only live for a year) and epehemeral weeds (which live for less than a year) are the easiest to control, as they are usually shallow rooted. However, they can scatter seed prolifically, so usually reappear and require further control.
Deep-rooted perennial weeds (which die down in the winter and re-grow each spring) will re-grow from their roots if the tops are removed or burned off. They can be difficult to dig out and may grow up through weed barriers in time.
Weeds can be controlled whenever they are troublesome, which is usually in the spring and summer months.
It is a good idea to put weed barriers in place in late winter or early spring, as they work better as a preventative than when an existing problem requires suppression.
Reading, England, United Kingdom
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