This selection of perennials are easy to grow and produce summer colours in a range of patriotic blues, reds and whites.
Centaurea shown above has many varieties in different shades and is a good cottage garden plant. It grows2-3 feet tall and needs some support. It’s red colour is much more pink but the blue is strong and long lasting.
Hardy Geraniums are attractive and easy to grow. The colour range includes the purple to blue or pink and Splish-Splash below which is a white with occassional blue patch. My black geranium has very poor flowers and rampant foliage.
Lupins flowering above are another easy perennial. In addition to red, white and blue there are bi-coloured Lupins with a white eye that can be very attractive. This pink looks a bit wishy washy in the photo but in real life it was a stunner.