Random Riddle: Four Of Us

Four of us are in your field
But our differences keep us at yield

First, a one that is no fool
Though he resembles a gardener’s tool

Next, one difficult to split in two
And a girl once had one as big as her shoe

Then, to the mind, one’s a lovely bonder
And truancy makes it grow fonder

Last, a stem connecting dots of three
Knowing all this, what are we?
 

Random Riddle: Four Of Us