For flowers to last long and stay fresh inside a vase, the water should be changed every 2 to 3 days. Remove any leaves or foliage from the stems that touch the water as well as any leaves that fall into the vase to prevent bacteria from forming in the water. 

Before putting the flowers back into the vase, give the stems a fresh cut, half-inches, so they can suck the water better after staying in the water for a long time.

Keep away from fruits and vegetables because they emit ethylene gas that will make the flowers open faster, which will make the petals fall from the stem faster, too.

A container flower is arranged by sticking the flower stems into a piece of foam inside a vase or container. These flowers should not be pulled and put back into the foam every 2 to 3 days because foam is soft and it will break apart. Simply check the water level and add more water as needed.

Keep away from fruits and vegetables because they emit ethylene gas that will make the flowers open faster, which will make the petals fall from the stem faster, too.