If you have a large, spacious room where the arrangement will be seen from all sides - for example, a grand entrance area or a large reception room - one big, all-round statement piece will work much better than a few small displays. Choose a substantial container and fill it with an abundance of lush, opulent seasonal flowers. It's also worth thinking about what the arrangement will stand on: A base or side table will influence how tall the flowers and foliage should be.
If you are designing a centerpiece for a table that serves as a gathering spot - whether in the den, breakfast nook or office conference room - remember that people need to see each other above the flowers. Choose low arrangements and simple designs, and make sure the flowers complement the container. The flowers will also last longer, as their stems will be short.
A windowsill, mantelpiece, desk or shelf may seem a difficult spot to fill with flowers, but a long, slim container filled with bulbs or potted herbs will suit the space perfectly. This type of design will also last a long time in a sunny spot; bulbs and herbs with roots will grow well if there is enough natural light in the room.
A tall arrangement will create the right impact if you are working in a high-ceilinged room, an entrance hall or need to draw the eye upward. Displays for this space work best if they are not overly fussy, so keep them minimal, striking or architectural in design perhaps with just a few carefully chosen flowers. A tall vase is a must.
Rather than following the standard approach of putting the different flowers in a mixed bouquet into a vase together, consider separating the different elements into individual containers that fit well in different spaces. For example, place roses and gypsophila in different containers. The gypsophila becomes a delicate cloud of tiny flowers that has an airy, dreamy quality while the deep, rich tones of the red roses look exquisite when densely packed.