The Crystal Tree is a unique building that can be purchased in a special quest for a limited period of time. For completing this quest you will also get a reward that includes a large pile of coins and special items for upgrading your buildings.
When you've purchased the Crystal Tree, you'll instantly get 1000 crystals; once the Tree is planted, it starts bringing 50 crystals every 24 hours for the next 30 days. After this period, you will have an option to extend your subscription to this offer and continue generating crystals for 7, 30 or 60 more days.
Important: don't forget to tap on the Crystal Tree and collect your accumulated crystals at least once a day! Just like a regular tree, this one needs someone to collect the harvest before it starts bringing more fruit, or crystals in our case. Enjoy this shiny offer!