Detailed Explaination of the Prism Flower Method for Events?

Tried this method for the first time and I think I went wrong somewhere.

-Cleared land till the gem store was available -purchased 5 prism flowers to create 2 of the next level up -harvested wood till I had 2 level 5 dragon trees -merged bushes till I made 2 sky Palace wonders

I ended up with about 10 dragons thanks to the wonders and ruby mystery eggs I picked up along the way. I also made 2 giant life flowers. Do I now just repeatedly click on the flowers to make sure the dragons harvest? A lot of them seem to just wander off. Should I focus on opening more land/creating more flowers to harvest? Determined to figure this out so I don't have to keep spending all weekend paying events .