A current favorite flower combination includes cinnamon basil, cornflowers, and cowherb or Vaccaria hispanica (you could get a similar look with Gypsophila elegans). Cowherb is actually a native, endangered plant where I live so I was happy that it was included in a wildflower mix I recently planted. Planting cutting, and replanting and saving seeds of native flowers is a great way to practice sustainable floral design. 

If you want to learn more about sustainable flower growing and arranging, please check out our workshops at September Flower School!