The grand final of the competition is to be held at the National Botanic Gardens, Glasnevin, Dublin on 7 May.
The winner will receive the £2500 Travel Bursary provided by the Percy Thrower Trust, to be used to further their horticultural career anywhere in the world.
The eight winners of the regional finals held during March who will compete in grand final are:
Scotland – Lachlan Rae
Ireland – Francis Mulholland
Northern – Sally Newbrook
North West and North Wales – Joshua Stevens
Midlands and South Wales – Lydia Mackay
Eastern – Fern Champney
South East – Lawrence Wright
South West – Miriam Petry
Last year's winner, Jessica Evans, is senior gardener at the National Trust's Tintinhull Gardens in Somerset.
Andrew Gill, president of the Chartered Institute of Horticulture, said: "I am excited about the Chartered Institute of Horticulture Young Horticulturist of the Year competition which just gets better each year and I am looking forward to the Grand Final in Dublin.
"Last year over 1,800 young horticulturists from around the UK and Ireland competed for the title. Since the competition started in 1990 an incredible estimated 25,000 people have participated in this prestigious annual competition which attracts more positive coverage for the profession each year.
"We are indebted to our national sponsors: The Shropshire Horticultural Society, which is the major sponsor of the competition and who, through the Percy Thrower Trust, provide the Travel Bursary prize for the winner and also the considerable sponsorship of the Grand Final, the recruitment company MorePeople, the Agriculture and Horticulture Development Board (AHDB) and Wyevale Garden Centres Ltd.
"There are also many regional and local sponsors and I am also delighted for 2016 to welcome The Horticultural Trades Association (HTA), as a new Gold national sponsor."
