Question: what flowers are navy blue?
Answer: Blue hydrangea: Blue hydrangea is an absolute breathtaking flower. ... 
Delphinium: Delphinium flowers come in some of the truest shades of blue colour. ... 
Dandelion: ... 
Grape Hyacinth: ... 
Clematis: ... 
Bluestar: ... 
Bellflower: ... 
Balloon Flower: