My First Mayapple

The naturalist is not so,
Until he can determine
What scat belongs to what.
Or, in that perfect day
In May or June, look
Upon the plump Mandrake's
Fruit, and eat it after rubbing
It upon their shirt.
Only a seasoned naturalist
Can know the time
For all others are poisonous.
The plush juice, like a Granny Smith
Cucumber mixed with bug.