One resource I looked at was https://github.com/Thinkmill/react-conf-app -- but your f8app looks even better than that! I like going through the package.json of other RN apps to learn about new tools. Some of my favorite packages so far are react-native-code-push, react-native-google-analytics-bridge, react-native-image-picker, react-native-smart-splash-screen, react-native-vector-icons, and redux-persist.
Congrats on your launch! Your site is well-designed. And definitely, I'm thinking that building in some social features should be my next step. One idea I have is adding a timeline for each of your plants so you can see how they've grown over time, and then letting you share those timelines with your friends.