Earlier this year I grew my parsnip seed in a plug tray and dug a patch over in the garden, ready for when the plants were big enough to be planted out. I made sure there was plenty of depth -- at least double spade depth. The soil is also very light, so my parsnips should have grown straight down, yes? NO! Every single one has balled and I cannot understand why. Could it be that the soil is too rich? They have had plenty of water throughout the year and have grown into really healthy plants. But not as they should be, more like cricket balls with tentacles. Any suggestions as to why this has happened and how I can make sure it doesn't happen again?