Culture
Easily grown in average, medium moisture, well-drained soils in full sun to part shade. Prefers moist, organic soils. Established plants have some drought tolerance. Plants prefer some part afternoon shade in the St. Louis area. In hot summer climates, the primary bloom runs from late spring to early summer (June - July) with a lighter bloom continuing throughout summer into fall. If bloom interrupts in the heat of the summer, plants can be cut back to rejuvenate, shape and/or encourage a late summer/early fall rebloom. In cooler northern climates, plants usually bloom well throughout summer into fall. Side stems may be removed or trimmed at any time to control spread.
‘Nimbus’ is a sterile hybrid.
Noteworthy Characteristics
Geranium is a genus of about 300 species of annuals and herbaceous perennials from temperate regions. Many make excellent garden plants and many hybrids have been made.
Genus name comes from the Greek word geranos meaning crane in reference to the fruit which purportedly resembles the head and beak of a crane.
‘Nimbus’ is a hybrid hardy geranium (G. collinum x G. clarkei ‘Kashmir Purple’). It typically grows in spreading clumps to 10-18” tall. Five-petaled, finely-veined, bluish-purple flowers with white centers bloom from late spring to mid-summer, with some continued but sporadic rebloom throughout the summer, particularly in cool summer climates. Spreads by trailing stems clad with palmate, deeply lobed leaves. Young leaves emerge tinted with yellow but mature to bright green.
Problems
No serious insect or disease problems. Some susceptibility to leaf spots and rusts.
Uses
Rock gardens, cottage gardens or borders. Mass for ground cover. Containers.