The utmost importance in an arrangement is the overall harmony and balance. It is possible to combine two or more flowers in one floral design, but in this case choosing flowers that are compatible with each other is of utmost importance. In other words, the key to a well_balanced arrangement is to choose flowers that can strengthen the beauty of each other. What's important to getting the most out of the components of an arrangement is the harmony between the floral material and the container, as well as the overall balance. No matter how beautiful a flower may be on its own, if it does not harmonize with the rest of the material, the balance is lost and the beauty of the flower is wasted.
I have noticed that western style gardens _ such as those seen in big castles, for example _ characterize themselves by man_made forms that generally follow symmetric patterns. In contrast, Japanese gardens, while also man_made, always try to recreate lifelike landscapes, by using not only botanical elements but also water, gravel, rocks and other natural components. In a similar manner, when compared to western floral arrangements, Ikebana compositions also have a stronger emphasis in reproducing natural settings.