For the latest news and special offers from Goonhavern Garden Centre. Instagram. Address. Goonhavern Garden Centre, Newquay Road, Goonhavern, Truro, Cornwall, TR4 9QQ. Opening Hours. Sunday 10am 4pm Monday 9am 5pm Tuesday 9am 5pm Wednesday 9am 5pm Thursday 9am 5pm Friday 9am 5pm Saturday 9am 5pm.