How Many Blooms Were On The Worlds Largest Chrysanthemum?

How Many Blooms Were On The Worlds Largest Chrysanthemum? Longwood Gardens has unveiled the largest chrysanthemum ever grown outside of Asia: the Thousand Bloom Chrysanthemum. The amazing plant features 1,523 perfectly placed, uniform blooms on one plant. What is the largest mum flower? It is a giant chrysanthemum unlike any other autumn mum you’ve encountered.