Grosvenor horticulturalist James Mabon was a finalist at the North West and North Wales regional finals of The Young Horticulturalist of the Year 2010.
Mr Mabon, 24, entered the competition held by the Institute of Horticulture, which is open to any young person working in all sectors of the industry, having qualified as a horticulturalist five years ago.
Alongside eight winners from local heats, he was asked a wide range of horticultural questions, with three identification rounds to further test the candidates.
Only one finalist went through to the Grand Final, which will be held at Kew gardens in May.
Mr Mabon said: "I am thrilled that I made it through to the regional finals stage of this prestigious competition. Each step in the process was intensive and challenging and I wish the finalists the best of luck."
Grosvenor presented him with a certificate and cheque for £50 from the Institute of Horticulture as a reward for his success in the regional finals.
Managing director Iain Wylie said: "James is a highly popular member of the team here at Grosvenor and we are very proud of his achievement."