The Hereford-based nursery awarded iTunes vouchers to the West Midlands and South Wales first, second and third place finalists.
Wyevale Nurseries sales and marketing director Adam Dunnett said: "We’re delighted we could support the competition and donate and present prizes to the top three finalists in the West Midlands and South Wales region."
The regional competition contestants were asked a wide range of horticultural questions, some on a buzzer and some directed to individual contestants, with two identification rounds.
The overall winner was Josh Egan-Wyer from Pershore, who now proceed to the grand final of the competition. He is 23 and is the nursery manager at Pershore College.
The Young Horticulturist of the Year is an annual competition organised by the Chartered Institute of Horticulture.
The winner of the grand final receives the £2,000 Percy Thrower Travel Bursary, provided by the Shropshire Horticultural Society. This funds a horticultural tour anywhere in the world. Previous winners have visited Borneo, China, New Zealand, South Africa, the Himalayas, the Galapagos Islands, the United States, South America and Europe.