Delphi Strawberry Service is the cover name for Camp Half-Blood. The camp grows strawberries to pay for their expenses. The campers help pick and grow the strawberries, and the satyrs play magical tunes on their reed pipes to make the bugs leave the strawberry patch in every direction. Dionysus and his children (Pollux and Castor) use their powers to grow the strawberries as well. It is printed on the vans that are used for transportation in quests, or strawberry deliveries. There is a sign that says: Pick Your Own Strawberries Please.
Percy Jackson and the Olympians
The Lightning Thief
When Percy Jackson left the beach at Montauk and fled to Camp-Half Blood with his mom and Grover Underwood, he read signs that said "Pick Your Own Strawberries" on white picket fences, which Annabeth later told him were beacuse mortals see Camp Half-Blood as a strawberry field. Although the name "Delphi Strawberry Service" was not mentioned, Chiron explained to Percy that they grew strawberries for export to restaurants in New York and Mount Olympus. The camp director, Mr. D, god of wine, can make fruit-bearing plants grow with no effort, although it works best for wine grapes, Mr. D is forbidden to drink wine or grow grapes.
The Last Olympian
When the campers were heading to Queens-Midtown Tunnel, they traveled in three white vans that said Delphi Strawberry Service. One van is driven by Argus and the other two by harpies.