"Don’t think you can plant trees in containers? Think again. These birch trees are placed in large containers, and because the root ball is kept from growing outward, the whole tree remains smaller and more manageable."
By planting wisteria in a contained planter, you can grow and train these beautiful flowering vines without making a permanent mark in the ground. Best known as plant covers to offer shade and visual interest around arbors or pergolas, potted wisteria is great for small spaces, rentals, urban spaces or general decorative appeal. http://www.ehow.com/how_8091558_grow-wisteria-pot.html?utm_source=pinterest.com&utm_medium=referral&utm_content=freestyle&utm_campaign=fanpage
I quite like this idea for herbs, because they are small pots you could stagger the planting and bring mature ones inside to use, while others are still growing outside, then bring in a replacement and reseed into the now empty cup! It makes sense in a convoluted kind of way :)