Roses do not increase your storage. The only way to increase your storage is upgrade your barn (farm cash, bricks, tiles, glass, mallets and/or buckets) or external barn (gold).
Higher the barn's level gets the requirements change, under resources, costs and upgrades there is a list there for what cost to upgrade barns(regular barn and external barn) external is gold only
No money and gold are the only things that will increase cbarn storage rose seeds are to go in fields
Higher the barn's level gets the requirements change, under resources, costs and upgrades there is a list there for what cost to upgrade barns(regular barn and external barn) external is gold only