On 2 October staff from Burleys - which is contracted to Lewes District Council - chopped down the trees while they were cutting the grass. In a statement the contractor admitted responsibility and said it was carrying out an internal investigation "to establish exactly what went wrong and why".
It continued: "We will replace in full the stock destroyed by our actions and will work with the Community Planting Team regards a replanting programme, providing the appropriate resources to assist.
"We wish to extend our most sincere apologies to all those affected by our actions, and assure you that this is a unique situation against the well-publicized and acknowledged reputation for community and environmental work we do both locally for Lewes District Council as well as other local authorities and community groups across the region, as evidences in local press, our website and a plethora of social media."
The council also apologised and said it would work with Burleys' management team to ensure there was no repeat of the incident.