Initial heats will take place nationwide from early January until late February 2013. The competition is open to any horticulturist who is below the age of 30 on 31 July 2013.
This year's winner Douglas Mackay said: "Competing in the competition has been a fantastic experience over the past three years. I am planning to travel Europe studying fruit production and crop protection techniques."
The institute wants more young workers as well as students to take part. In the past three years, Royal Parks apprentices, Garden Centre Group employees as well as staff from Tottenham Hotspur FC and heritage gardens have entered.
The final will be held on 13 April. Sponsors include the Horticultural Development Company and MorePeople. For further details, see www.horticulture.org.uk or email email@example.com.