What if you pick a one leaf clover?
it means that you are going to have very badluck on the day that you pick the clover and the day after you find it. if you pick a two leaf clover, you will have some bad news the day that you find the clover. a 3 leaf clover means that nothing special will happen.
When you go and pick up your "daily weeds" there are normally some clover shaped weeds for you to pick up. Pick them up as you normally would, and on occasion one of them happens to be a four-leaf clover. They are not of much value(I attempted to sell mine before, they aren't even worth 100 bells.) but i admit they can be a quite fashionable hair piece.