I planted my parsnips in two raised beds. When I dug my parsnips this spring, some were normal (in the form like carrots) but about two thirds were short, stubby, and had bunched roots. No good. The soil is very fertile and loose. It is a problem because the parsnip is difficult to prepare and not very productive.
Certified GKH Gardening Expert
This article should help: https://www.gardeningknowhow.com/edible/vegetables/parsnips/how-to-grow-parsnips.htm
Make certain that you allow adequate spacing between them, as they require room for their roots to grow. You should also fertilize them as well.