Next year's centenary RHS Chelsea Flower Show will celebrate 100 years of the best new plants among other features.
Plans include a competition that will see the best plant from each decade of the show selected by the RHS before being judged by plantsman Roy Lancaster, head of shows development Bob Sweet and RHS historian Brent Elliott.
Growers who have exhibited at the RHS Chelsea Flower Show from the start include Kelways, Blackmoor & Langdon and McBean's Orchids.
Pennard Plants will show vegetable gardens from 1913 and 2013, while HW Hyde will exhibit 100 new lilies.
East Malling Research will exhibit the past, present and future of fruit research.
The centenary show will also feature Scotts/The Sun exhibiting four gardens to show how the plants grown have changed over 100 years.
The show (21-25 May) will feature 15 show gardens, with B&Q, Homebase and the Food & Environment Research Agency (FERA) leading the horticulture industry entries.
The RHS launched the event last week, announcing FERA and the National Trust as sponsors of a show garden to raise awareness of ash dieback. Designer Jo Thompson said: "I've got to find six dead ash trees 6-7m high, not diseased and not dead enough so they fall apart during the show. There will also be a six-inch symbolic ash seedling if we can get a special licence to get it there."
The garden will feature trees - including birch, London Plane, horse chestnut and elm oak - under threat from pests and diseases. Kelways is growing ornamentals for the garden.
Chelsea 2013 show gardens Details, designers and sponsors
B&Q: Prince Harry's Lesotho Sentebale charity garden designed by Jinny Blom.
Homebase: Adam Frost-designed and Willerby-built garden on sustainable living.
Royal Bank of Canada: Nigel Dunnett-designed garden on urban water management and creating more green spaces in urban areas.
Fleming's Nurseries: Last ever Chelsea garden will be on the rock bank and will feature baobab trees.
Daily Telegraph: Christopher Bradley-Hole's design will be Japanese-influenced with English-native trees and shrubs.
M&G: Garden Design by Roger Platts will celebrate of garden design of past 100 years.
East Village: Garden Design by Michael Balston and Marie-Louise Aguis for Delancy has the "designed for living" theme of the Olympic legacy East Village.
- Others include Stockton Drilling (Jamie Dunstan), Arthritis Research UK (Chris Beardshaw), Stoke-on-Trent Garden Partnership, Laurent-Perrier (Ulf Nordjfell) and Robert Myers (Brewin Dolphin).