Board Thread:Chinese content/@comment-26719208-20160321173715/@comment-26719208-20160504121205

Phanminhnhat wrote: What the hell are you doing?! Just need to go to the Greenhouse and click the button below the Twin Sunflower upgrade... You have to clear quests before you can unlock plant upgrades. You can click on the buttons in the Greenhouse but it won't do anything until it's green which you do by clearing quests. In Twin Sunflowers' case, it just sends you to a boxing arena which meant there was a quest related to it, but there was nothing I could do.

No need to be hostile.