Plantera

Your garden can be expanded once you reach level 5. The expansions can be bought by scrolling left or right and touching the arrow signpost. Each expansion cost more coins than the previous so you will need to save them up to buy all the required expansions.

Your expansions will cost the following:

1. 500
2. 5,000
3. 25,000
4. 100,000
5. 250,000
6. 500,000
7. 1,000,000
8. 5,000,000
9. 10,000,000
10. 25,000,000
11. 50,000,000
12. 99,000,000

See Worth A Million, for an exploit you can use to speed this up.