H. ‘Cool Blue’
Hosta ‘Cool Blue’ is a registered cultivar () , originated by R. Kuenster, AHS.
| Year registered | 2010 |
|---|---|
| Registrant | R. Kuenster, AHS |
| Section class | III-2 (Medium) |
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.
Size and leaf
| Clump height | 16 in (40.6 cm) |
|---|---|
| Clump width | 34 in (86.4 cm) |
| Leaf length | 7 in (17.8 cm) |
| Leaf width | 4.5 in (11.4 cm) |
| Vein pairs | 10 |
| Leaf | medium blue-green slightly rippled margins; glaucous bloom on top; glaucous bloom underneath; moderately cupped, moderately wavy, moderately corrugated |
| Flower scape height | 33–36 in (83.8–91.4 cm) |
| Notable characteristics | heavy substance, corrugated, wavy leaves |
From the American Hosta Society Registry record.
Similar cultivars
Other registered hostas in the same AHS section class (III-2, medium size):
- H. ‘Lederhosen’ (2010)
- H. ‘Blue Cascade’ (2009)
- H. ‘Canadian Blue’ (2009)
- H. ‘Purple Rain’ (2008)
- H. ‘Evening Blush’ (2013)
- H. ‘Delaware River’ (2005)
Related guides
Registration data: AHS Registry #1154