There are herbicides available against this weed. You can check it at a garden store. Digging their roots out is another option but takes a lot time because they go deep in the soil. Tools are also available for this purpose.
On my part, as I have bee hives (and dandelion flowers are really attracting a lot of bees starting from spring), I usually just pick the withered dandelion flowers and contain them by putting in my fireplace. That way, seeds will not have the chance to regrow. At the same time, I also dig some out. Of course, this is only realistic for smaller gardens which is what I also have.
“You got to be a gardener to appreciate dirty and muddy hands.”
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