Preferences:

Turkestan, Indian, and Tibetan perennial has a mounding habit but with staking can be trained to be upright. Geranium prefers full sun to partial shade, in average soil, heavily fertilization results in rampant growth and I  believe increase potential of powdery mildew.

Cultural Practices:

Propagation - First put the seeds through  cold/wet stratification for 3 to 6 weeks. Barely covering the seeds sow at 10 - 18 degrees for up to 40 days. The seeds can be sown in fall and placed outside for the winter.  Clump division can be done in spring or in fall but fall is better and the roots begin growing very early in spring.

Culture - Cutting back is very important as well as deadheading. The seeds seem to travel readily and eventually you will have a garden full of Geraniums. After flowering, the leaves are very susceptible to powdery mildew and should be sprayed with a 1 tablespoon/ gallon of baking soda in water to upset the pH; therefore, hindering the mildew.

Landscape Value:

Common Varieties: Geranium incanum 'Johnson's Blue' is probably the most ubiquitous on the prairies as it is quite tall and strikingly blue.

Geranium cinereum are smaller pink varieties that have become very popular in the last few years my favourite, mostly because it is so hardy, is 'Ballerina'. They have an earlier flowering time and greater resistance to powdery mildew.

Another variety which I really enjoy is Geranium pratense 'Splish Splash' it has variegated blue and white flowers. This is a newer introduction and may take some hunting but a real fun geranium if you can find it.