Geranium x 'Rozanne' is the 2008 Perennial Plant of the Year.
Hardy geranium, also known as cransbill, is well suited for zones 5-8. They should not to be confused with the florist geranium (Pelargonium) which is an annual. Hardy geraniums are a valuable addition in most garden situations from full sun to part shade, although in hotter climates half shade would be preferable. Due to a large increase in popularity over the past decade, hundreds of new varieties have been introduced in recent years. Out of this flurry of new varieties there is a wide range of climatic variability and many have turned out to be inferior selections.
'Rozanne' is one of these recently introduced varieties, but stands apart from the rest due to its vigorous habit, heat tolerance, and extended bloom period. 'Rozanne' was found in the garden of Donald and Rozanne Waterer in Somerset, England in 1989, and released by Blooms of Bressingham in 2000. 'Rozanne is a cross between Geranium himalayense and Geranium wallichianum 'Buxton's Variety'.
'Rozanne' develops a mounding habit 20" high and 24-30" in spread. Foliage is deeply lobed and dark green with light marbling. 2.5" iridescent violet-blue flowers are cup-shaped, with darker veining and a light center. 'Rozanne' is a sterile hybrid which extends the bloom time is from late spring to early fall. Should plants start to look ragged during the summer months, shear the plants back to 3" above the ground to rejuvenate growth for a fall full of color.
'Rozanne' works well for the front of the border and as a companion plant with many other perennials, including Phlox paniculata, Hemerocallis, Iris and ornamental grasses. It prefers moist well drained garden soils, but will tolerate a wide range of soil and climatic conditions.
