Colors

• If you want to create a romantic garden with lots of color, it's best to choose flowers and accent plants that have their own identity but complement one another. For instance, the red and white hues of the arbutus plant, a bloom that means I love only you, will pair well with yellow flowers like the jonquil, which is a sign of love and affection.
  
  

Size

• To give your garden a whimsical and romantic feel, plant flowers of various sizes. For instance, large blooms like daisies or sunflowers give the viewer a feeling of joy or happiness (which sets the mood for romance), and look pretty coupled with small thornless roses, which symbolize love at first sight.
  
  

Considerations

• A monochromatic romantic garden is also a great idea if you have limited space, or want to feature only your favorite flowers. For instance, a red-themed garden filled with carnations, roses and poppies, symbolizes admiration, love, and pleasure, sentiments that are very fitting for a romantic garden setting.