As well as the annual RIBA Stirling Prize — won by the Maggie's Centre in London last year — one fo the awards will go to the most exemplary public space.
The RIBA CABE Public Space Award will be presented to the creators of the best space between buildings.
The £5,000 prize "recognises the growing importance and valuable contribution that well-designed public spaces make to the quality of our built environment and to our daily lives".
The closing date for entries is at 5pm on 19 February.
Subscribe to Horticulture Week for more news, more in-depth features and more technical and market info.