Earth Day Flowers and Information
Nintendo introduced Leif The Sloth, he was in New Leaf.
Leif is guaranteed to be on your island during Nature Day, which takes place on April 23rd to May 4th.
He's basically a vendor like Kicks.
He can randomly still be on your island after Nature Day is over. (not sure though)
You should sell your weeds to Leif cause you'll get more bells than selling it to Nook's Cranny.
He sells a variety of flowers, he'll sell flowers that are not normally on your island or in Nook's Cranny.
I have no more time so I'll add later.