When should I cut my arbor vitae hedge?

Garden Experts
Hello Mr. Kötter! Can I prune my arbor vitae hedge quite severely during the current weather conditions? I would like to reduce them in size from 3 m to approx. 1.50 m.

The GARDENA gardening expert

Dear Mr. D., yes, you can do that as long as the weather remains frost-free.  Remember to guide the cuts slightly diagonally to prevent water lying on the cut surface and promoting rot.