Today I had the battle of my life with the dandelion on my front lawn. First a question about this: I removed every piece of it by using a long knife that I used to laterally insert as deep as I could so I could cut the root. Then I grabbed the plant and pulled it out from the soil quite easily. My friend would bet his life on it saying that the dandelion will get back to life from that root (most of the times it was cut like an inch under the soil level) Is he right?
Yes, he is right - you need to remove all the tap root, right down to the pointy bit at the end, or it will regrow, usually producing a 'double' plant, that is, with two lots of leaves as if there are now two plants.