How to Make a Tall & Round Hydrangea Centerpiece

Cut floral foam with a knife and wedge the pieces into the bowl or vase for the centerpiece. For example, cut two blocks of floral foam at least 3 inches thick and stick them side by side into the bottom of a wide bowl. Wedging the foam in tightly keeps the flowers stable. Start with pieces of foam larger than the inside of the container and cut them down, if necessary.

Cut the stem of each hydrangea at a 45-degree angle to allow the bloom the most water uptake. Prepare an uneven number of hydrangeas for the centerpiece, cutting them so that three flowers in the center will be the tallest, ringed by five to seven flowers with stems 1 to 2 inches shorter to create the round effect.

Gently insert each stem into the floral foam, beginning with the three tallest flowers. The number to use depends on the size of the blooms and the size of the vase. For example, to surround three large round oak leaf hydrangeas, you may need seven to nine blooms. Add another circle of flowers with stems 1 to 2 inches shorter than the previous circle of flowers to create a round centerpiece with smaller hydrangeas.

Stand back and view the hydrangea centerpiece on all sides. If any of the blooms stick out higher than the others in its circle, push the stem deeper into the floral foam until it's even. This creates a balanced rounded arrangement.