This includes displays at Heathrow Airport, where "cosmopolitan cubes" have been planted with red, white and blue flowering plants. The company's self-watering containers have been used for most displays.
Bespoke steel containers have also been manufactured and planted with a variety of trees and shrubs and installed in locations surrounding the Olympic venue. All the plants were grown at the nursery's site in Kent.
Amethyst managing director Nigel Fox said: "We have been meeting our clients over the past three years to plan how we can meet the demands of 2012. This is the culmination of that work and testament to our philosophy of quality and customer service."
Amethyst is also contracted to maintain the hanging and pole baskets, barrier baskets, free-standing and tiered planters throughout summer and into autumn.