Since this topic is "Pulling potato plants from sprouts" I thought it best to compare pull sprout/plants of regular potatoes to sweet potatoes. Sweet potato plants are sold and bought as "slips". I suppose we could say Irish Potato Slips. The main thing to consider is that sweet potato slips are fairly leafy when pulled from the sweet potato root. They usually at least some roots. I am including a few links to photos below to show how this is somewhat similar to sprout pulls from potatoes.
http://homeplaceearth.files.wordpres...eet-potato.jpg
http://farm4.static.flickr.com/3241/...9d1f66b5a8.jpg
http://img.diynetwork.com/DIY/2005/0..._Step_5_lg.jpg