The leader of Manchester council Sir Richard Leese says it's important to move the flowers in St Ann's Square as part of the recovery process of the city.
Thousands of people have laid tributes following the bomb attack on the 22nd of May.
The Council say staff and volunteers have been working hard to maintain and preserve it for as long as possible in a fitting condition.
As many as possible of the flowers that are still in good condition will be pressed and preserved by Manchester Art Gallery's Conservation Studios, with some used in memorial books to be presented to the families of the 22 people who lost their lives in the attack. Pot plants left in the square will be replanted across the city centre and any remaining flowers and other plants which are in a worse condition will be used for compost, to help new life flourish.
People can still pay tribute at Manchester Cathedral. There are opportunities to light or candle or sign a book of condolence and the council's online book of condolence can be found at www.manchester.gov.uk/condolences.