I grow blue flowers every year. Some flowers die because of the summer sunshine or the long winter coldness. The followings are strong and my favorite blue flowers. I am still looking for healthy and beautiful blue flowers.
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Bottom, Viola Yesterday,Today & Tomorrow, Lobelia Blue Splash, etc.
Behind, red purple Foxglove Light purple, Delphinium Right, Salvia Tesquicola
Purple rose, Cardinal de Richelieu It's a must for Blue garden(?)
Also, I expect Veilchenblau.
Moss, Alfred de Dalmas.
English rose, Glamis Castle Behind, S. guaranitica