Within the Wakfu interface (default shortcut: w), there are up to 6 flasks. Each shows indicators for Crops, Wild Plants , and Trees, and up to 3 monster family. For Marketplace Territories, none may be present.
However, Clan Member will only concern themselves with 1 to 3 of those types. This is indicated by bars shown on the relevant flask or a small indicator below each flask. The Clan Member's Will is that the level of each population is between these bars, no higher, no lower. The Clan Member's Will can also be found in the little indicator located below each flask.