You must have CLOUDSTONE BLOCK and GLASS BLOCK to make CLOUDS. This item belongs to building category. Growing CLOUDS takes less than half a day, so no worries yeah. Want 8 experinece points? Brake CLOUDS block or tree. Hitting it will break it but you need to count the hits yourself. You get at least 1 seed back (maybe more!) from splicing CLOUDS. Profiting with this might be questionable. Massproducing CLOUDS can be tricky. You will find out after you have harvested a few.