Potatoes are often on the Dirty Dozen list (which changes every year, so give it a quick search to find the current year's list), so it is better to buy organic when you can. Potatoes are grown underground, which means they can absorb the pesticides sprayed on the plants and the surface above them. I scrub my potatoes really well and try to buy organic when I can. If you're concerned and aren't able to buy organic potatoes, you may want to peel them before consuming.