For a Rounded Vase
Ideal flower match: Roses (shown) or other species with rigid stems, such as daisies, chrysanthemums, and carnations.
Why the pairing works: Flowers with sturdy stems can stand tall in a container that has a generous opening, which also allows you to pack in a lot of blooms and spread them out in a sculptural dome. A spherical vase beautifully echoes the circular heads of roses.
How to arrange: Remove any leaves and thorns with floral shears, or snap them off with your fingers, says Waga Perez. (If you wish, retain a few leaves for a green accent.) Group a bunch of roses on one side of the vase and mirror it on the other. Designate the center for flowers that are an inch or so taller than the others.