They ll foster a rugged sense of adventure and a taste for self-challenge. You only need three adults. In the beginning the needs of the grove can be portioned out as they arise. Later when the group gains momentum and size, defined positions must be established. One person is needed to act as the director.
Groves quickly die through lack of communication.
Another person acts as the program or event coordinator. The main purpose of a grove is to climb trees and have fun. If a grove isn't out adventuring in the treetops, interest and enthusiasm is replaced with disinterest and boredom. The third person will concern themselves with training and outreach - gaining new members. Finding new climbers and making sure they get proper training is the foundation of grove growth.