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will dandelions sprayed with weed killer still produce seeds

If you only have a small number of dandelions that have bloomed, hand-pulling is a simple and effective way of eradication. Dig them out using a weeding fork or a dandelion digger, both of which you can find at nurseries and garden centers. Pull dandelions after a rain or after watering, when the soil is moist and soft.

A post-emergent herbicide that is applied after germination, when dandelions are visible in your lawn, can be the most effective herbicide to use against this weed. Other herbicides that kill dandelions include those containing carfentrazone, sulfentrazone or triclopyr. The best time to spray dandelions is in September, after the dandelions have bloomed and are moving carbohydrates from the leaves to the roots for the winter. If you apply herbicide in the spring, the best time to apply is in May, or when temperatures are above 60 degrees Fahrenheit.

Dandelions typically bloom in both the spring and the fall. Right after blooming during both seasons can be a good time to kill dandelions because these weeds are usually weakest immediately after flowering. This is because their reserves of food and energy are usually at their lowest. While the fall is typically considered the ideal time to kill dandelions, the spring bloom is the heaviest bloom, so this can also be a good time to kill dandelions by hand-pulling or with the aid of herbicides.

Hand-Pulling Dandelion Taproots

Dandelions (Taraxacum officinale) can be a major problem in lawns and gardens. The bright yellow flowers of this broad-leafed plant can pop up all over your landscape, ruining the hard work you put into keeping it healthy. Prevention of dandelions is difficult because you don’t usually realize you have a problem until dandelions bloom. The good news is that it is still possible to kill dandelions after bloom.

The buds grow from the top section of the root, which produces a crown that can regenerate even when you cut the top of the dandelion off. Root sections as small as 1 inch can produce new plants. The dandelion blooms yellow flowers that eventually turn into whitish-gray balls. These wispy puffballs contain the seeds, which can be carried by the wind for several miles.

Dandelion is a perennial weed that grows in U.S. Department of Agriculture plant hardiness zones 3 through 10. It prefers moist soils and full sun but can survive dry conditions and will grow in some shade. Its persistence is due to its strong taproot that typically grows to a soil depth of 6 to 18 inches, although it is capable of reaching soil depths of 10 to 15 feet.

It’s vital to get at least 4 to 6 inches of the dandelion taproot so that the remaining portions that are still in the ground don’t have enough energy stores to sprout new leaves and buts. If any of the dandelions do regrow, dig them out again. You may have to hand-pull dandelions a few times before they stop coming back.

Dandelions will invade a thin, stressed turfgrass stands so the best way to prevent dandelions it to maintain a dense and healthy lawn that will make it hard for weeds to grow — a thick, vigorous lawn will keep many weeds out.

Late spring and fall is the best time to use broadleaf herbicides to kill dandelions.

New Dandelions Can Sprout From the Taproot

Crabgrass preventers (Pre-emergent herbicides) applied in the spring before weed seeds germinate will also help to reduce the amount of dandelion weed seedlings that germinate and grow in lawns.

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