Hydrangeas have a very distinct, rounded shape that make them an ideal choice for eye-catching floral arrangements. Typically available through late summer and early autumn, these flowers can be found in a variety of colors, including shades of blue, violet, pink and white. The blossoms of the hydrangea plant grow in thick clusters, and each cluster can be used in your decorations as a single flower, providing a big impact with each stem.
Cut the hydrangea blossoms early in the morning, before the day gets too hot. Take a bucket or vase of room-temperature water with you and drop the hydrangeas directly into the water once they have been cut.
Select a wide-mouthed container for your hydrangea arrangement. A mug or pitcher will lend a quaint, country feel to your decoration. For a more modern look, opt for a wide, cylindrical glass vase. Use a bucket or basket for especially large arrangements.
Arrange the hydrangea blossoms loosely in the container to determine the height to which the stems should be cut.
Fill the container with fresh water at room temperature.
Cut the hydrangea stems to the desired length with a sharp pair of garden shears. Dip each stem into a small bowl of alum before placing it into the container. This will help the hydrangea blossoms last longer.
Arrange the trimmed hydrangeas to create a full, rounded display. The largest, tallest flowers should sit in the center with the smaller blossoms around the edges. A layer of greenery at the bottom of the arrangement can help to support these rounded blossoms. Add additional greenery and baby's breath to the design to help fill it out, if needed. You can also add a variety of other flowers for a mixed bouquet.
Display your hydrangea decoration in a prominent place where it can add significantly to your home's decor. Fresh hydrangeas make a bold statement on an end table, sideboard or coffee table. A shorter hydrangea arrangement can be used as a centerpiece on the dinner table.