How do you kill pigweed?

Online Answer
One of the best ways to prevent spiny pigweed is by using a pre-emergence herbicide containing the active ingredient trifluralin. Treflan is one of the well-known brands, Preen and Eliminator also make trifluralin products. Pre-emergent herbicides work by preventing weed seeds from germinating.
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The leaves of pigweed are also incredibly nutritious. They're high in vitamins A and C and folate, as well as calcium. In Jamaica, pigweed is known as callaloo and is a culinary staple.
Lams quarters, (Chenopodium album), also called pigweed, annual weedy plant of the amaranth family (Amaranthaceae), of wide distribution in Asia, Europe, and North America. It can grow up to 3 metres (about 10 feet) but is usually a smaller plant..
The entire plant is edible, including the leaves, seeds, flowers, and stems. Pigweed leaves have a green and slightly astringent-sweet flavor with a semi-coarse texture.
Rotary hoeing: Pigweeds are easily controlled with a rotary hoe when less than 1/4" in height. Flaming: Flaming is very effective on small pigweed plants (less than 1.5" in height). Crop rotation: Small grains suppress redroot pigweed in the rotation..
In these conditions, many herbicides break down over time and Palmer amaranth will keep growing. It can grow from 2 to 5 inches (51 to 127 mm) in three days, or less..