Up until now, all I’ve been doing is watering my plant every 24 hours (and even that’s only if I remember), hehehe. Every time you water your plant, 0.02 HIVE is sent to your wallet.
You can also help water other people's plants.

There is currently a Hivegrove leaderboard running, similar to the Ecency daily quest. You earn points for every action you take, and there are rewards at the end of the season.