Some of the most enchanting posies in a vase are those just collected from your yard in the spring. The less organized looking bunches that are clipped right from the branches can bring your outdoors in and give it that thoughtful feel as though your home is inhabited by someone quite charming.
Grandma used to cut simple cherry blossoms, Forsythia or Lilacs and let them stand tall in a jar so that the family could celebrate the warmer weather due. Doing this for your Open House gives it that special edge and keeps your home fresh and even smelling lovely.
Let people enjoy the whole branch that holds the blossom. Your greenery is already built in and it will keep the flowers up high while they impress.