You can make NUMBER BLOCK by combining PASTEL BLUE BLOCK and EXCLAMATION SIGN. You can find this item in misc blocks category. Better plant this and come back later, it takes some time. Breaking NUMBER BLOCK gives you 6 experinece points per tree and block you brake. Hitting it will break it but you need to count the hits yourself. By default you should get at least 1 seed back. Gemratio of NUMBER BLOCK is a mystery. Maybe you can check the wiki for <a href="https://growtopia.fandom.com/wiki/Number_Block">number block</a> Massproducing NUMBER BLOCK can be tricky. You will find out after you have harvested a few.