All Lv. 7 planets support Walkr's "Fast Harvest" function (by tapping the gold coin button at the bottom right). This makes it easier for you to harvest your planets!
Also, if the Walkr Core levels up to Lv. 10, Crop Bot will be automatically unlocked. Long-press the tomato and the dinner plate buttons at the bottom right corner of the main page to harvest resources and feed the planets more efficiently.
Please watch this video to see how to use Crop Bot: https://www.facebook.com/walkrgame/videos/1032036386849505/