Six holes were found drilled in the trees. The area was roped off and experts were called in to see if they could be brought back to health. But despite plenty of care and attention they could not and have had to come down.
Principal Ross McLeod said the stand of big trees had been a treasured part of the playground for many decades and it was sad to see them go.
"It is a shame to lose them because it was such a nice area and now we'd like to do something to ensure it stays a nice area."
Plans would be put together to re-landscape the area with parents, children and the community invited by the school board to come up with ideas as to what they would like to see.
"We hope to get on to it as soon as we can," Mr McLeod said.
A landscaper would be brought in and new trees were likely to be part of the equation.
In the wake of how the trees began to deteriorate during the past months, safety had become the number one consideration, Mr McLeod said.
The trees had been valuable in terms of providing good shade for the children, who played around them as the school had a strong "sun smart" programme.
Since the poisoning there had been suggestions someone in the neighbourhood was unhappy about the shade they cast but Mr McLeod said residents he had approached and spoken to were disgusted and saddened to see what had happened.
Police were advised and dropped leaflets throughout the area, but the culprit had not been identified.