You are likely to have an upset stomach and possibly vomit if you eat a salad bowl of most spring wild edible plants. The reason is that they contain such high levels of vitamin A that your body has a bad reaction to it.
If I may ask, wherever did you get such a crazy idea???
What you state has never once been true for me or my friends in 30+ years of foraging edible wild flora and fungi.
As to vitamins in edible wild foods, that varies greatly by species. One simply cannot say that "most" have any vitamin, much less "such high levels".
The seasonal variation in nutrition is indiscernible without laboratory equipment.
To assert that "most" edble wild plants will make you sick after a single serving is an epic falsehood.
How would I know?
Been foraging edible wild flora and fungi for 30+ years. Eaten 150+ species. I eat 40+ gallons of wild vegetation every year. (Mainly use gallon ZipLocs, occasionally 5 gallon buckets, when foraging. So gallons is my usual unit of measure, even for dry goods.)