Students studying arboriculture as part of their horticulture degree planted around 25 unusual tree species last week, under the direction of the college's senior arboricultural specialist Charlotte Power.
The trees include a variegated pine, Pinus wallichiana 'Zebrina', and a rare golden form of the giant redwood, Sequoiadendron giganteum 'Aurea'.
Around 60 first-year higher education horticulture and landscape design students also planted trees as part of the expansion of the college grounds and arboretum.
They were led by senior horticulture lecturer Michael Lavelle as part of their practical studies programme.
Lavell said: "Trees are a vital component of all landscapes and something that we can all too easily take for granted. Most of our students will go on to plant many more trees in their horticultural careers, but there will always be one that they started off with, back here at the college."