H. ‘Cool Blue’

Overview

Registered in 2010 by R. Kuenster, this medium-sized hosta produces broadly ovate, blue-green leaves with a heavy glaucous bloom on both surfaces. The foliage is notably corrugated and moderately cupped, with slightly rippled margins and eight to ten pairs of veins, giving the plant a textured, substantial appearance.

In the Garden

Hosta 'Cool Blue' forms a dense, mound-like clump reaching 16 inches (40.6 cm) in height and 34 inches (86.4 cm) in diameter, with a moderate growth rate. It performs best in partial to full shade, where its blue-green coloration remains most intense, and pairs well with ferns, heucheras, and other shade-tolerant perennials. The 33- to 36-inch (83.8 to 91.4 cm) blue-green scapes bear pale lavender flowers in midsummer.

Care Notes

Provide consistent moisture, especially during dry periods, and apply a balanced fertilizer in early spring as new growth emerges. Like most hostas, this cultivar is susceptible to slug and deer damage; regular monitoring and appropriate barriers are recommended in typical hosta-growing zones.