A disease exists in Europe that is never diagnosed here: Spring fatigue. Around February, March, April everybody complains about it - and suffers.
Spring fatigue happens when the body is depleted of essential nutrients at the end of the winter, after not enough fresh fruit and vegetables in the cold months.
Do American people not have it? I think they do have spring fatigue - they are just not told about it. Because there is no pill against it. And the rather like to think they have spring fever...
Yet the remedy is easy: Eat about as many fresh greens you can put your hands on: chives (around this time I put handfuls of chives on and in about everything), dandelions, spring onions, stinging nettles, kale, chard, spinach. Many might be weeds in your garden.
Stinging nettles? Yes! It is a weed, but I planted it in my garden on purpose (in a raised bed). Yesterday, I made my first nettle soup of the season. The recipe is easy: Boil one or two cut potatoes (including skin) with a little bit of water and salt. When half soft, add stinging nettle leaves (the stems are tough; you need gloves to handle nettle because they sting), olive oil and pepper. Boil until soft - only a few more minutes. You can puree it - I did. But one can also just eat it like a green vegetable. Never forget the olive oil - without fat, your body cannot assimilate vitamin A from the greens.
Europeans think the stinging nettle is the most valuable herb, period. They use it for a tonic, strengthening the body overall. It is also good against hay fever, but you better buy it as phyto-caps for that purpose. The nettle root is used against prostatitis.
Make sure you know your herbs and harvest your herbs from a clean place - not where dogs pee on them. Go for a local herb walk to learn about herbs.