The foundation course included practical work, courtesy of Arborco Tree Services, with director Simon Moore helping the students find trees to try new skills on.
Mr Cooper described his company as the "travelling sideshow of arboriculture."
It works in all aspects of horticulture, arboriculture and line-clearing work for power and phone companies.
He said the 12 trainees were all "solid, very capable and willing to learn." He was hopeful they would go on to get jobs in the industry through a a three-year apprenticeship which would result in a Level 4 advanced certificate in arboriculture.
The foundation course is run with Telford Polytechnic. The 12 who attended were aged between 17 and late 30s.