Both lilies and freesias last relatively long in a vase and will tend to look fresh for 10 – 14 days as long as you follow the care instructions and change the water regularly. Orchids and Carnations have the most impressive vase life of around two to three weeks. The longest-lasting white flower is Baby’s Breath, also known as Gypsophila. Florists often add these ethereal flowers to bouquets, as they last forever.