Making a room out of cardboard??

Can I section off a space in a room with flat white painted THICK cardboard? (2 sides walls, 2 sides cardboard) But I will probably cover the wall's with painted white cardboard?

You sure can.
U-Haul makes a big box for $20.00 or something.

unless its a really small section. honestly. wood would be cheaper, and more effective.

building a basic room really isnt that expensive. or build a grow box.

Just think of how much moisture a piece of cardboard absorbs outside overnight. A small grow should work but i'd be afraid of mold/mildew if using much cardboard for a larger grow.