Six saplings have been snapped by vandals across the borough in recent days.
Five trees along Digswell Road in Welwyn Garden City, planted in 2013, and one on Briars Lane in Hatfield are among the latest to be snapped in half, on Sunday July 8 and Wednesday July 11.
Each tree costs the taxpayer approximately £100 to £150 for planting and maintenance.
A tweet from Welwyn Hatfield Borough Council said: “The five trees along Digswell Road were only planted five years ago and were just beginning to establish.
“Those responsible for this mindless act may think it’s just a harmless prank, but acts like these put an unnecessary burden on the taxpayer to repair the damage that has been done.
Councillor Stephen Boulton, executive member for environment and planning delivery, said: “We are always sad to receive reports of damaged trees in our borough, they are something our community values highly and are there to be enjoyed by residents and visitors.”
The council is appealing for information and encouraging people to report by calling 101 with crime reference number 41/16850/18 for Sunday’s damaged trees, and 41/16830/18 for Wednesday’s.
Council leader Mandy Perkins also tweeted, saying: “WGC is a Garden City and trees are integral to this.
“These particular trees in Digswell Road have been targeted too frequently.”
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