There are three different categories of garden at Chelsea 2012:
Show Gardens
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There are no theme, subject matter or plant content restrictions imposed on Show Gardens. Traditional or contemporary, we actively encourage diversity of design in this category. If the footprint of your intended garden sits outside those outlined in the Application Form please contact the Show Manager to discuss further.
Fresh Gardens
3 x 3m modules from a minimum of 9sqm to a maximum of 12m frontage by 9m depth and any variation of layout within these dimensions
These gardens take away the constraints of a defined category, we are looking for show gardens that will engage both media and visitors alike through design innovation and creative use of existing and new materials. We are challenging designers to be brave and step outside the perceived traditional Chelsea garden. Designers can create a space that fits their purpose, concept and budgetary constraints. Fresh Gardens are about a feel and vibe with any one of the following words describing their look: 
Artisan Gardens
5m frontage by 4m depth or 7m frontage by 5m depth
Designers are challenged to use an artisan approach to build methods and choice of materials when designing their gardens. The RHS will look for show gardens that will engage both media and visitors alike through the artistic use of materials from natural and sustainable sources. Artisan Gardens are sited in Ranelagh Gardens and staged against a wooded backdrop.