When you arrive at Cape Caem, there is a house where Talcott, Iris, Monica and Dustin reside. Talk to Iris on the porch until she mentions the garden. You’ll be given a little tutorial message that walks you through farming, and Iris gives you some carrot seeds.
Run around to the back of the house and into a little fenced off area. You will mounds of dirt so approach the first one and plant the seeds. You will need to rest overnight in order for them to grow.
When you return to the garden you should see 3 carrots sticking out of the dirt. Pick them and you’ll get introduced to Tony. He will trade you items for carrots. I recommend grabbing the Ulwaat Berries for 2 carrots since you’ll need them for another quest.
You’ll receive 500 EXP.