im "done" with the event. With a high Flower Bed you can farm and merge alot of bigger "hearts" and clean very fast the maps. But it's made that you can not clear the whole map without spending rubys. The last part you have to put in a open big chest to open it. Not sure if you can get a big open chest via the event quests (which, to be honest, is BS if you have to harvest from specific items you already emptied, because of the lack of space or if your nymphs harvest them automatic if you not careful.)
My mind is mixed if it comes to events like this with a new map to clean. It takes sometimes way to long and the rewards are not that much different then playing the smaller events with the loot that comes from playing normal Levels.