The Arboreal Grove is available in your Mog Garden after completing Green Groves. Every earth day, you can gather from your grove a set number of times, which increases per upgrade.
Upgrade key items can be purchased from Zenicca for bayld, or from Skipper Moogle for gil.
Upgrades become available depending on the total number of real-life days in which your grove is pruned.
Upon reaching rank 3, a second tree appears, along with some bushes.
Upon reaching rank 5, a third tree appears, along with some bushes.
Upon reaching rank 7, a deciduous fern appears.
Fertilizers[]
Fertilizers will persist for 7 gathering attempts.
Instructing Yeestog to "repair the tools" will occasionally grant free gathering attempts.
Every gathering attempt yields items in the following order:
1-3 items from the Prune trees+Either lists or the Remove weeds+Either lists. Which action is available is randomly chosen after every gathering attempt, and is specific to that grove.
Choosing to gather multiple times will perform that specific action until it becomes unavailable. As a consequence, an initial "gather multiple times" with "prune trees" active will cause the next set of actions to "remove weeds", and vice versa.