Geranium - Cranesbill
There are many perennial species of the true, hardy geranium, and many are reliable, long-flowering plants. Most cranesbill geraniums (not to be confused with tender, pot-plant pelargoniums) are easy to grow and are ideal in perennial borders, as edging plants, or as an infill between shrubs. Some species self-sow freely, but unwanted seedlings are easily removed. Cranesbills range from about 6 to 39 inches tall. Most have attractive, deeply divided leaves, and the flowers cover a range of shades, mostly in violet, blue, pink, rose and cerise. Most like sunlight, but some other prefer shade. They need open, well-drained soil, but it doesn't need to be rich. Very acidic ground should be limed before planting. Use a soil testing kit to ascertain the quantity required. Sow in February, March and October. Divide in April and transplant in May. Flowers June-September. Most are hardy to 5 degrees Fahrenheit.