Wilting floral displays at Lalbagh

It is a sad reality that nowadays, by the time it’s 26th Jan or 15 Aug, the flower displays are wilting and well past their prime at Lalbagh. Why do the displays have to open so much before the actual dates? Or if more days are needed for the general public to attend, surely the display could start fresh on Republic or Independence Day, and go on for a few days thereafter?