H. ‘King John’
Hosta ‘King John’ is a registered cultivar () .
| Year registered | 2010 |
|---|---|
| Section class | II-2 (Large) |
Overview
Registered in 2010 as a sport of Hosta 'Sir Richard', 'King John' is a large, upright-growing cultivar distinguished by its intensely blue-green, broadly ovate leaves with slightly rippled margins and moderate corrugation. The foliage, reaching 12 inches (30.5 cm) in length and 9 inches (22.9 cm) in width, exhibits a slight shine on the upper surface and a glaucous bloom beneath, with 15 to 17 vein pairs.
In the Garden
'King John' forms a substantial clump 48 inches (121.9 cm) in diameter and 36 inches (91.4 cm) in height, with a moderate growth rate. It performs best in partial to dappled shade, where its blue-green coloration is most pronounced, and is well-suited to mid-border or specimen planting in typical hosta-growing zones. Companion plants may include ferns, heucheras, or other shade-tolerant perennials that contrast with its large, bold foliage.
Care Notes
Provide consistent moisture, particularly during dry periods, and apply a balanced fertilizer in early spring as new growth emerges. Standard slug and deer deterrents are advisable, as both pests may damage the foliage.
This summary was generated with AI from the registry record and has not been reviewed yet; the registry data on this page is the reference. How we use AI.
Size and leaf
| Clump height | 36 in (91.4 cm) |
|---|---|
| Clump width | 48 in (121.9 cm) |
| Leaf length | 12 in (30.5 cm) |
| Leaf width | 9 in (22.9 cm) |
| Vein pairs | 17 |
| Leaf | intensely blue-green slightly rippled margins; slightly shiny on top; slightly shiny with glaucous bloom underneath; moderately corrugated |
| Flower scape height | 30–40 in (76.2–101.6 cm) |
| Notable characteristics | very large plant with very large foliage |
From the American Hosta Society Registry record.
Parentage
- Sport parent: Sport of H. 'Sir Richard' — H. ‘Sir Richard’
Similar cultivars
Other registered hostas in the same AHS section class (II-2, large size):
- H. ‘Aksarben’ (1988)
- H. ‘Andrew's Moody Mom’ (2010)
- H. ‘Blue Pointer’ (2010)
- H. ‘Blue Seer’ (2010)
- H. ‘Blue Sensation’ (2010)
- H. ‘Blue Veil’ (2010)
Related guides
Registration data: AHS Registry #3027. How we check this data.