You guys said I could ask them...

I watched Bill Grumbines video and understand why you turn green wood, but being a newbie I don't have a stock of dry materials stored in bags to use for turning other than making glue ups. Can you use already dried blocks of wood to make bowls? Reason I ask is because I saw a block of maple about 8"x 8" x 5 feet at guys shop sitting in the corner (it's been there for years he said)and wondered if that can be used after cutting into short (bowl size) lengths. Or is it that it turns harder than green wood, and not worth the trouble?