Anyone tried Mayapple/mandrake? The fruit is only edible at a very specific time: when they are turning yellow and are on the verge of falling off. Otherwise, it's poisonous. I've never had the balls to try one, but it would be cool, since here's a plant that very few humans have ever tasted.
>>28253I don't know about all thistles, but stinging nettles are edible if you boil them first. Or if you have a very high pain tolerance. In Britain there's apparently a raw stinging nettle eating contest.