So here I am, earned one more expansion on Desert Island in Sunflower Land. As you can see from the image here are requirements for next expansion.
- 3200 coins (have them) 
- 250 wood 
- 125 stone 
- 15 iron 
- 15 gold 
- 30 crimstone 
- 100 oil 
- 60 gems (I have 91 right now) 

Every expansion you have to collect a little bit more resources to advance. I think 100 oil will take me most time to collect.
This is expansion number 16 and it will cost me exactly 64.69 Flower tokens which is around USD $6.5
I also need level 58 for next expansion, but I'm almost there, I have 77807 / 118500 XP points.
For upgrading to Volcano Island, which is my goal, I need 10 more expansions and 200 oil.

Volcano Island is the place where I can produce Obsidian (rare and expensive material).
There are 4 seasons in Sunflower Land, each lasts for 7 days. During each season there are random cataclysmic events and today is Tornado effecting my farm and buildings (see image). You can buy protection for all events but I didn't have one for Tornado, so I'll have some losses.

Daily reset is in 17.00 local time, in 3 hours and that's when I'll be able to use my farm plots as usual.
If you want to join Sunflower Land follow this link.