3) Plant the flowers into a jar or jars. Designing dining room table centerpieces, jars are most of the time needed. They are to plant the flowers as well as keep the planters clean. A jar or, in this case, a glass jar is the best flower container option because its transparency is perfect to create some natural look.
Happy decorating, then.
In this case, there are still rooms for you if you want to make some improvisations. You can combine the planter with some beautiful colorful flowers.
2) Design the Planter. The most unique fact about flower plants for centerpieces is that the more natural they are the more interesting they will be. Why, because flowers will look the most beautiful if in their real habitats, in the gardens, parks, lawns, etc. Thus, what you can do is to design your planter naturally. Even sometimes you can make some planter that looks rustic, making use of some leftover or else.