Well he should be in the Deeper Forest behind the Gaping Plant, this requires the Fairy Queens audience first to reach.
Use Pixie Dust deep inside the forest in the hidden grove statue.
Gift a proper gift to not get kicked out.
Play with the Pixies + Bonus Thiccness.
Then ask the Queen of the gaping plant.
She will ask for a gift.
Then you need to have had the Milk farm refurnished.
Plus a way into Upper New Ark. ~Quality Passes~
Plus a hefty sum of Credits.
Plus a refinery from Upper New Ark Mall.
After all that when you have obtained the refinery you can then use it to make cheese.
That's what she wants. ~Cheese~
After all that she will tell you how to tame the plant.