You can make STONE WALL by combining GREY BLOCK and ROCK. STONE WALL is in building category. This seed grows fast, less than 1 minute. Received experience is a mystery. Keep an eye out for the exp counter. How many times you need to hit it? Head to the wiki for more info: <a href="https://growtopia.fandom.com/wiki/Stone_Wall">stone wall</a> By default you should get at least 1 seed back. Profiting with this might be questionable. Will you get enough blocks to build something? You just have to find out yourself.