. The best blue-flowered geranium is probably Geranium Rozanne ('Gerwat') (PBR). document.write(''); google_color_text = "FFFFFF"; Geranium grandiflorum. A must-have!! Beautiful plant, but plant with something that can fill in that foliage gap. Plants need to be cut back hard in midsummer to encourage fresh new foliage. in stock (shipped in 3-5 ... Deadheading will prevent them setting seed and so use their energy producing a further flush of blooms later on. On May 31, 2002, tiG from Newnan, GA (Zone 8a) wrote: Blooms wonderfully. document.write('