You must have ACID and RUINED SIGN to make PUTRID GAS. PUTRID GAS belongs to category. Growing PUTRID GAS takes 2d 09h 32m 29s Breaking this block will give you 12 experience points. 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 PUTRID GAS is a mystery. Maybe you can check the wiki for <a href="https://growtopia.fandom.com/wiki/Putrid_Gas">putrid gas</a> Will you get enough blocks to build something? You just have to find out yourself.