How to kill a weed that has overtaken my dad’s garden.

Question

Years ago my dad’s friend suggested that he put some of his sheep manure on his garden. Ever since then there is a weed that has overtaken his garden. I even tilled my garden and it started growing here. Is there a treatment we could do in the spring to kill it? The first picture is it at full bloom. The second picture is of it taking over this row.

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Answer 1

Use a pre-emergent in spring to eradicate quickweed. If any remain dig by hand or use a post-emergent herbicide.

https://www.gardeningknowhow.com/plant-problems/weeds/pre-emergent-herbicides.htm

https://www.gardeningknowhow.com/plant-problems/weeds/post-emergent-herbicides.htm